{
  "manageEntity": {
    "action": "Save",
    "entityId": "976514605",
    "entityType": "Track",
    "nonce": "0xf4f689dc2b1ff1800b3ca3f9882c20b9ec3f96c07ff05a8cc0931b81b2b7e0a1",
    "signature": "0xbaab14246221ecbbe36bf1e491ca878705d73ac237631e4ddc4b86b89c8590e80304609b919fd24f6c838fcb2be1df013c76f174ebd5428cb0b74e1a34f8473e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}