{
  "manageEntity": {
    "action": "Save",
    "entityId": "501616704",
    "entityType": "Track",
    "nonce": "0xff525f0bb08b1c8ef625df55da91ffb33fa45ed5e71c048434000bfbd2fc8ef0",
    "signature": "0xc357ab0059155c5b00c07ff65845b8af9f1460781c7dbd18d2374b172a94f71166e338e23673027ac250dc717ed5e384b4e6ba316cfea941302d684f4c57aafe1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}