{
  "manageEntity": {
    "action": "Save",
    "entityId": "139931020",
    "entityType": "Track",
    "nonce": "0xbf30a2dd7ccd9b1da74a80e36b8942fac1760a5d936c04478c7c67d1a677c758",
    "signature": "0x4e6152df9fedf8448a611e9c0079a2a5fc5d27e5b4ed96f268ea0dec2a5123f710c5ce31a9fd9edc440f9452a15f6d13c203d5c3f5d36ef2941e77a986e7e7881b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}