{
  "manageEntity": {
    "action": "Save",
    "entityId": "1951876734",
    "entityType": "Track",
    "nonce": "0xf87dc1b6481f4b6559e5cc319ab288029efaf212db0d67a0076c8d27c77c0f74",
    "signature": "0xdddc8dffbcae6e4f7ce8f82f1b87aa4849164ed41e79032667712403ebde45684d457b2785247c7b0987be4883932778e84dae0753f3cb77cc5c4d7a7270b7981c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}