{
  "manageEntity": {
    "action": "Save",
    "entityId": "2140204946",
    "entityType": "Track",
    "nonce": "0x705b8df8ae9a00cb2b163fa5525da793ba20350ecb605c6796e58b57e4a8456e",
    "signature": "0xfd738c23ab46cc51fd743766ee9099003db5f38850ba655b8ce38a08e03da4fa4051abb5cfa4905fa986c112e4f9d3bdf922a1fa96ea495364ec981a5568346b1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}