{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389728",
    "entityType": "Track",
    "nonce": "0x13e3b7d55d1870c6b1029d1fc24fd2760eeaee19abf218777289b49c3af97055",
    "signature": "0xe6a8a4bb393ae051224bbfbf56ce558de9162526fa06bdb565a94ccaf5779f8f55957a6ae4dfbf3f01bc21ea6cd22195e669ca2eadd5be983f5f1aa76c610a951b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}