{
  "manageEntity": {
    "action": "Save",
    "entityId": "1984872465",
    "entityType": "Track",
    "nonce": "0x1e2e490171b3c00d2d064d6137698916c48b4a4bd497acd1520ff146a9e327ad",
    "signature": "0x0cb9a6946edfa06a1e6987e327c24e8f647cf6aaacf2d41ec7129fa65d1327067fa5864e057975424defbc7cc75a79939793c9f2609395b7ba704a9485f630c21b",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}