{
  "manageEntity": {
    "action": "Save",
    "entityId": "1475228773",
    "entityType": "Track",
    "nonce": "0xe3d65cf8e5077d2e794885112b1b48d89e020f6da3cdb7d1210837c15ed253b3",
    "signature": "0xcc7852965375e142327d4527814ac26635a5d37cb9aa04fa6260abd6319655ca63d1630d123c016fb9d87c39f07c048eb503f0e0a29456c4a0dbaf2e14695bbc1c",
    "signer": "0x1D0c500EC847246923045cB0a285242A93723f30",
    "userId": "302385956"
  }
}