{
  "manageEntity": {
    "action": "Save",
    "entityId": "279974",
    "entityType": "Track",
    "nonce": "0x40b0fad32e00e134ee951dea2358719e39dab9239d1ec738e725cc21c6c275ed",
    "signature": "0x13cb990c8f568e600533d22db64a066bc09fd15fdb1573d19d36523b4b8d2ccc472a64f919d329796b56277b93e70df37b50c2fbc6e0e31de2e81f61fbf150821b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}