{
  "manageEntity": {
    "action": "Save",
    "entityId": "129289",
    "entityType": "Track",
    "nonce": "0x2f636c8249c1ddd56e1e2d45e3022cc4e9158e050482f79724042548ddf4a54f",
    "signature": "0xc9ce9f625ec7dbd23cd31ea1f1dbccc26ef0419221bd5168288a821ccc30c9f12f8baf5089ffdcc837b04a4f8a9141e51f4794559d430f0d5b34cc6567ebfdcf1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}