{
  "manageEntity": {
    "action": "Save",
    "entityId": "644673304",
    "entityType": "Track",
    "nonce": "0xa036f24eb48afda053171ec1831b8f485e696c58994959a4f365dd850d70e676",
    "signature": "0x14baa0202c46dca02e5c9f97c1556aae0cfc614cab479295b9e48b22f783ada32e8b42c4c86f8990d2a99693ef0a7aba0aa8e75295fc62e7391eb970b06670b31b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}