{
  "manageEntity": {
    "action": "Save",
    "entityId": "544308",
    "entityType": "Track",
    "nonce": "0xbcf50019344872fe8ee847a4a4b3ee0a246bd501144a2157b82bc66e43b4e56c",
    "signature": "0xcba3a0e8ec6d1331abf1c46337774095c0607e5129d62117d2b01879b95643967dcda9210d35ff96d95c966521a54121f755535b5827af28036cc7c963d2b5a71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}