{
  "manageEntity": {
    "action": "Save",
    "entityId": "543473",
    "entityType": "Track",
    "nonce": "0x7c51f84798e8668b1dd95f1d4a58aabc0ebec4f1a2b5a7ac9bbc897bddf145da",
    "signature": "0x7bc3ef16d94dc5ab211213799dcd1605decbbdbfc0525a96167fb6b503adf65d3bf2518a88fe8dcd068de9f3b151f9e86a7ad98528f303a5abc4d30e0716d83a1c",
    "signer": "0x64B0DA55A684D51d3EF114Fe644eac7db132fDb7",
    "userId": "121304325"
  }
}