{
  "manageEntity": {
    "action": "Save",
    "entityId": "1538402470",
    "entityType": "Track",
    "nonce": "0x11286c24b52a39ea44980ed428fddb3c6d52d4b78f69a232bc3966656d702bd5",
    "signature": "0x905484acb13539951310ce55f6c2b8b4447c38ebdad59a330b79c75d2ca6f25a499b2cbfd6dede0f6c14d3cdb101135b0828efc57de0d8ad3d162d5110fa176e1b",
    "signer": "0xa4A8a4853051b18e0f0f777693Ce34CF4bCe9385",
    "userId": "634886384"
  }
}