{
  "manageEntity": {
    "action": "Save",
    "entityId": "1977433399",
    "entityType": "Track",
    "nonce": "0x9196fe7d40ed31f603430a71b8ce0d9b8c8edaa65a2299d071044a1658e81705",
    "signature": "0xd82c6230214a5de92c117b08e2e545bc5fa961b49a516bac8aed13678f7108a129dcd08225d982adf2363dacd80a2719d7d9020c8442b9857052e3581d25df2b1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}