{
  "manageEntity": {
    "action": "Save",
    "entityId": "557677",
    "entityType": "Track",
    "nonce": "0x030d14b8a8c7b785a86ee8c9225b44d25a402f8fd1f5d96933bec2bc09347c1f",
    "signature": "0xd383a956776f1b2fd4eadd00f04bbfe61aff20562828799d466dcbd5814bcfdd25ad563dba78dce15761e48aa55d203178468af9d2be59b63f025ba7f94bf5001b",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}