{
  "manageEntity": {
    "action": "Save",
    "entityId": "121333",
    "entityType": "Track",
    "nonce": "0xedfce39019193a8d8c366808a8152a80941235d8ee288549b844a8ddb29c7981",
    "signature": "0x6b50b8b873c9fe77a27dc9cb6734de5e761e96729af6f05397c5595678bc8ac21f0d7c91d40ee22e0e63d90313dfd64de0a2a64fda662e92c93c39b113c7259e1b",
    "signer": "0x3D4d8a781454E2338c482dE697d6DE1ACc7D9031",
    "userId": "599751364"
  }
}