{
  "manageEntity": {
    "action": "Save",
    "entityId": "702311791",
    "entityType": "Track",
    "nonce": "0x83f119062db047e088a5ae3cb1643c464f494d728ce5a94b798ac46a0a78c3be",
    "signature": "0x77ceda7d9c80c9a0412c5a816fff92faf89c5bfe2bca355ebf39c4e2486dd6a47bb961b659c13c7be49e7cd15c6f5918d2cdd51a33e238fce13cba3df97324ed1b",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}