{
  "manageEntity": {
    "action": "Save",
    "entityId": "1416603629",
    "entityType": "Track",
    "nonce": "0x97cf8da841d54040865085892d992240806c10173a06ed82b4c54d3bfeee5ea3",
    "signature": "0x409a68ee3ab5220bd40b70e77791f1cf3afa9c502e90a6b15cc39494c869bb837c3de8a39cfd3a36f232c633b49e34dfbb5ffe19feebf9d0b24557f6439920ab1c",
    "signer": "0xE929d5b0D27781f83f0b5A8e37b2652DBe76579B",
    "userId": "319129"
  }
}