{
  "manageEntity": {
    "action": "Save",
    "entityId": "214119723",
    "entityType": "Track",
    "nonce": "0x9977d7118c20d195140b577efbe09bd8a0316df1f483e22f4542c85c7a8b10c2",
    "signature": "0xafb995ab25efed1dfa40ecc489adca906d02ef85e42138a3f6767f3e93b4c1f667de811913943be30218c67791ad6cf6e2ba89098cb27fe8406bfa1be9bc76901b",
    "signer": "0xDd320Ea9a099A13D44fB85307EafaF14e61fe55F",
    "userId": "820149711"
  }
}