{
  "manageEntity": {
    "action": "Save",
    "entityId": "1233471890",
    "entityType": "Track",
    "nonce": "0x7d2e21ce90ef673608efb8a54e63087fcc2c174c3e4f1ad1f2431b452114c69c",
    "signature": "0xf55cfe19f8c8f68fce67783fc0d52c5800166a8add9b611fd1391e73cd8eb0e23e9ad052cf3a4fd9abb1bb7b0ae3339b0625ba2ff039df12e0c4ce76f77af88a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}