{
  "manageEntity": {
    "action": "Save",
    "entityId": "487619362",
    "entityType": "Track",
    "nonce": "0xe8042668d50a18e69d5291628e669872b09ac212f77c7a1f1effb42884be2145",
    "signature": "0x11c70de6041b89bb789360de07e360ea78a52b695d43dd63655a23d13d9861a00efb279fec19d9dbca084b3ff33fec282927fde44ccb310f4b37fda7d0051ccd1b",
    "signer": "0x6B239e9B75f27b519de7Bad3a26a0b7d30e32D3f",
    "userId": "311257477"
  }
}