{
  "manageEntity": {
    "action": "Save",
    "entityId": "591822439",
    "entityType": "Track",
    "nonce": "0xb109b3879ec6a7ff2e8bbb29781f329e0ac3a995d98156db9cea434a86705e54",
    "signature": "0xf30c3cc38c7ab8d77aecd546d7adf2587c275aeca41fa8dc8aad543f00c1fa211e7582a94733ee6b792b2b294f401f6bb96f596f55662560ee875e1b03ff9b191b",
    "signer": "0x38C35E6d98e3a8e47c96Cc5d8e8DC05C8797Ce75",
    "userId": "266305231"
  }
}