{
  "manageEntity": {
    "action": "Save",
    "entityId": "215665909",
    "entityType": "Track",
    "nonce": "0x14c5f1216d57a7cd55a8eb87645bff7d14d70d645811f01418017374cfc964ca",
    "signature": "0x3dbeddf2e2d5f4630b862fcd662a6157e4d8de9140ef7f94fec4b8cd02dd66136e8fd5a7796e54e49c10715096dc1af07b3b9eb42bae90a8c73c0f01ec8a5c941b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}