{
  "manageEntity": {
    "action": "Save",
    "entityId": "2143516629",
    "entityType": "Track",
    "nonce": "0x251cc36a361c5accc037f57d68b6eb625830f93ebc29153900059709c65c5bde",
    "signature": "0x405eb31f215224d8330997e1529fa5e507cc25684dee327b8c97d7a37620070a78adbb20dbd47bed30fe5f687742bf3cec4981c9b2add3597600faaeb2ed3fca1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}