{
  "manageEntity": {
    "action": "Save",
    "entityId": "919592028",
    "entityType": "Track",
    "nonce": "0xc9a5615333cee89b14614f5ff964bbab57f5a07ad499da0afbad348ec580352a",
    "signature": "0x28ffb054160e9ec275f8718fdd71b9116acb452168b3aa43318c5efe23071640512b0efa36d0ce1202378ad98abfbe6d497b4d3794ac6324614d908ad324c7a71c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}