{
  "manageEntity": {
    "action": "Save",
    "entityId": "1645754764",
    "entityType": "Track",
    "nonce": "0xc021936d91ac692a17bc8c03321236c0dec0bc8a2458cab43981490a3460dd67",
    "signature": "0x04f9194b5cc68017790337badd5c4b1e8d5cc5f9564adf69bfa5b5d0157464a6417f74e1c0306bd448252c890e9beab5c4fa1d9916d91648012cb922da1d0e681c",
    "signer": "0x65b2681094e762CAD2349e6C1e2FbC8d54b9c046",
    "userId": "11153747"
  }
}