{
  "manageEntity": {
    "action": "Save",
    "entityId": "1409964610",
    "entityType": "Track",
    "nonce": "0x8b7890e7a676c7fd6643a3c725bf2ef16cb013823e95f5be12cf8b028006d70f",
    "signature": "0x3879e084c8f35bfa4e907dc7739a44012c8181875a0b58902046f1afb5673b0577c1a745264b3bfb5e5730c0c05de90b3504b6e7f4e62d8c04ba5dc819872db21c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}