{
  "manageEntity": {
    "action": "Save",
    "entityId": "2104128123",
    "entityType": "Track",
    "nonce": "0x20d15ef37a9267fc17eff0b6cdaab800317d23e155002fc021de77b1bfad5cbd",
    "signature": "0xe75f6897002b33ee3b17dc94768a47f9236eb910f127160e606bbdadac024ea661409c7e13e1365901918d4b11e08605ed08d3f167bc1c378045067a62d009961c",
    "signer": "0x569a23a5D506E4404139fB7510738Ee5b80F5624",
    "userId": "280440301"
  }
}