{
  "manageEntity": {
    "action": "Save",
    "entityId": "2138028025",
    "entityType": "Track",
    "nonce": "0x9139747c867c8300d33494c51cedc0af93d31a62270c73a081b148f35a202ec0",
    "signature": "0x8b8fbee64c4dbca3541f87235d7deb013c93ddea5a9490f0998a84fb5c903d2d6c3f620964583754505b1da9c20ab9588246182ad755a29da4b060ceed0b40de1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}