{
  "manageEntity": {
    "action": "Save",
    "entityId": "281617018",
    "entityType": "Track",
    "nonce": "0xfa09f137163b0aec5fee3ccbd71e0f3fcbf68013653b2b39735bb71191ea7bc6",
    "signature": "0x689085b14874fd02ff7cb767f96401e683ed47334576de1780b4e894f9e6117e67a3f607c7b5500be0be678119f2a399a69e18b2ca301972eb39040bc52174d41c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}