{
  "manageEntity": {
    "action": "Save",
    "entityId": "2123157230",
    "entityType": "Track",
    "nonce": "0x3d47cd8072e3bc18b3083def0102b1ecaf152c5fa08065180f65edca9e8d78f5",
    "signature": "0x043694dabbbe7324b35cb476286dd8481431e04b6cc0f2358a4eddd55615eeac0176ab3e9a040238d53e0bcfad11a495a809fec8f1e706fdaf4f5c6e13736f201c",
    "signer": "0xbbB98413eB671bb0000F0b18A2A7Cae9631043E1",
    "userId": "98311147"
  }
}