{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544182186",
    "entityType": "Track",
    "nonce": "0x41efb836aa923b2b66a6a0890ec5c93b4ff7d7bc5fb8c49019234bf11171eea0",
    "signature": "0xbdc4a881ee7292337855688fbbc311b9086bddbac61be977ec11dd2d3a5bdb12246dcca62badbdbb28d300f1a840c5651e4d0e7ac9432e827338325eca2e4a7b1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}