{
  "manageEntity": {
    "action": "Save",
    "entityId": "531021",
    "entityType": "Track",
    "nonce": "0x373ab4fc2ee90b4a7eb2f8a7886183da5a8b09864d093ee7967c3005d134f5cb",
    "signature": "0xe4d1118da84591c8c600569d8ec6ba14157e75136b5c9fed4fe5d6a4b8f886a16a547edc37814d3413914c2d18f91b27d81ef86181a8fedb56bbe3d4901719b51b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}