{
  "manageEntity": {
    "action": "Save",
    "entityId": "904156327",
    "entityType": "Track",
    "nonce": "0x4009377e232319b68c8f951a9ec2e221824ee6847cb8c608c63dbe1f980b2154",
    "signature": "0x12aef9263e01db4eab72acc619ba7d48b0f60dc18926a8bbfcc6ff2e0f351d933c94160bc744688d3335a399f9782f2730f38e9ab940c0b1cbbd4c981f30c0e51c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}