{
  "manageEntity": {
    "action": "Save",
    "entityId": "1790892369",
    "entityType": "Track",
    "nonce": "0x475eda074e1417c061a54b3e57d09458894d397564b36b3cbb5b0757fa8cf81f",
    "signature": "0x037450889eea48aba6234d56e7c93017ed73fee33001cd0a2aed2aea965271e6436b5d88a085181fa70ef852c02c77a098e4d1237233a8548d404b399ffb98731c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}