{
  "manageEntity": {
    "action": "Save",
    "entityId": "425768766",
    "entityType": "Track",
    "nonce": "0x646e0d38e0d09a12bd2e7501548685d0f4eb11801a00175161babca7d2227845",
    "signature": "0x7691413a82037c4cfdc5910dbdb8bc9d4caac50fc1c7213752d9bfd259c6310f5e4c514e708155ea65e03d4bce21d694e38b8eaf653d3220503896b84f9ab5001b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}