{
  "manageEntity": {
    "action": "Save",
    "entityId": "984781412",
    "entityType": "Track",
    "nonce": "0x21ce28d208c20767c8e1dd9506ca598987072064a4c5b187b7ce84b65eb776aa",
    "signature": "0xa6bff0a2163911a9dbf735ecc4e1476a388a34ab179e3c801a4b72ab861a2581196190248544048345174251028be98f3a31fa65c35bad3ed0af9ab0fbd4fbc01b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}