{
  "manageEntity": {
    "action": "Save",
    "entityId": "1530821571",
    "entityType": "Track",
    "nonce": "0xbf6398555ed515ad300810cf2723212a147b5ef3d11646b533c829e716e99b7c",
    "signature": "0xaa8332be5aef1c46692f7c2adf83292eca7f7a0520101c069a422a2a5efd7cb43b08b4f7d235af39ef7bf5d4f520b35ea005dd004f979f66286aeefa5e7932521c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}