{
  "manageEntity": {
    "action": "Save",
    "entityId": "144288090",
    "entityType": "Track",
    "nonce": "0x19e71ee475f99ca6c26f8ea7846be13f7a95baa162a5015f3d5aa86477e20545",
    "signature": "0xdd9428b6b79681224dfcdba323ed8959abe5279ea7855868d5c9633439ceeda6735b4912c523751534e5ff98249ffe207015f61fe0ac82b1f8713a90533beea61c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}