add a token container with serialization as CARv1 file

go.mod

@@ -1,11 +1,10 @@
 module github.com/ucan-wg/go-ucan
 
-go 1.22
-
-toolchain go1.22.4
+go 1.23
 
 require (
 	github.com/ipfs/go-cid v0.4.1
+	github.com/ipfs/go-ipld-cbor v0.1.0
 	github.com/ipld/go-ipld-prime v0.21.0
 	github.com/libp2p/go-libp2p v0.36.3
 	github.com/multiformats/go-multibase v0.2.0
@@ -20,6 +19,9 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
+	github.com/ipfs/go-block-format v0.1.2 // indirect
+	github.com/ipfs/go-ipfs-util v0.0.2 // indirect
+	github.com/ipfs/go-ipld-format v0.5.0 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.8 // indirect
 	github.com/minio/sha256-simd v1.0.1 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
@@ -28,9 +30,12 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/polydawn/refmt v0.89.0 // indirect
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
+	github.com/whyrusleeping/cbor-gen v0.0.0-20230818171029-f91ae536ca25 // indirect
 	golang.org/x/crypto v0.25.0 // indirect
 	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	lukechampine.com/blake3 v1.3.0 // indirect
 )