{
  "manageEntity": {
    "action": "Save",
    "entityId": "449524519",
    "entityType": "Track",
    "nonce": "0x44dba652d66eb091366a3e91983fff101ce31c16be24dc2058af710dcd069a1b",
    "signature": "0x56336d1a8deacc6dc68ef209aabb9150f3cc71795ae289d17c763dfb1ebfbf620cceebcce1e9c1eac7163fbf8f0a2e7e2f2b7c29eedf74f7a18ccf99bde682051b",
    "signer": "0x8876AcafD0aa73B9f12a77496b87C699aF42B15f",
    "userId": "906222947"
  }
}