{
  "manageEntity": {
    "action": "Save",
    "entityId": "1876574811",
    "entityType": "Track",
    "nonce": "0x7c208592e4c7570133429fa6aab7f2a2642f6b2b01c33f78992b35e2be813f89",
    "signature": "0xdb180fa4654c431a640a23053a1454271fc6ff4b28b17ac00d23bd956f4f8ddd5f2b7bd1d71ab3d9a35bad219e4f30237d515a62b6603d2084a07804443189201b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}