{
  "manageEntity": {
    "action": "Save",
    "entityId": "1102138902",
    "entityType": "Track",
    "nonce": "0x75dac9fb9c4f0888ecffccf011edd9b3d81417bef3906bc5fc0b9f4c32f01c88",
    "signature": "0x99b3af50ce30d070a8618cf0460186bf61afe42a7f0e83a5dcb30134ec3a6bd7226fc6cddbcab6c9c09dbe017b694c6989846bd0085863aecf2e50c5f301b2f61c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}