{
  "manageEntity": {
    "action": "Save",
    "entityId": "544314",
    "entityType": "Track",
    "nonce": "0xd4e749fa88e12aaebcc1859cdf0c2df5a68b88fcb2968fe05534bd20c37fea9a",
    "signature": "0x5e26edbf37f0ebf8c1297c1368804ae1daad8af1842c3fc1f29ab78aa08236e07d8295c8250625e8cf407f3fcff860852f7b5fb22f748df44ea12c70a770085c1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}