{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519003501",
    "entityType": "Track",
    "nonce": "0xb997749c09bbfc9086cf949be4b6a4c2387e1abd1d4028a9e5ab6354ffc7c159",
    "signature": "0x1e82748623568b57f487e0e67e597cd0f6b15f842504df3106d71d0e7faf46e8363b440b6a05f1625455ddbe90d8a34440fe5bc6731cca58f967fa0b6edd046f1c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}