{
  "manageEntity": {
    "action": "Save",
    "entityId": "1943855485",
    "entityType": "Track",
    "nonce": "1792442824790144810",
    "signature": "0x85b6f6076738b4afc2abe59f6ab1c22cf05da947bd218beab5e824532ad1eba93f4552807f63788aad766819e53be3c0d363673c719b69f780565681aba347001c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}