{
  "manageEntity": {
    "action": "Save",
    "entityId": "944756722",
    "entityType": "Track",
    "nonce": "0x2b7357fede8fcb974bcbef6caa34c78dc66aab110f034ab66241d328f3179c6e",
    "signature": "0x44acfdb3ad97ac0d2caad070a254ccc637775da342f90c801004daec14c5b56d30bccbf3b853b2cd3f307309e35ecbfa02e4ec19d969deff179c4ef94b52086c1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}