{
  "manageEntity": {
    "action": "Save",
    "entityId": "457564817",
    "entityType": "Track",
    "nonce": "0xf4f933a82a17ff060b44d8afd65a29819cffcf037f4fe4ba917d819ed4417792",
    "signature": "0x9f5737a4287c5106475e1e270ec4d1cacdf3db14c10baca4c8075463f508725561986e1cfb0516d68b781ae3227ccd97323220ce3f82e48b9b2e78f748801d371c",
    "signer": "0x94e0dDC50579175818AaCFBC9aba8B065fEf2a55",
    "userId": "460147282"
  }
}