{
  "manageEntity": {
    "action": "Save",
    "entityId": "145566902",
    "entityType": "Track",
    "nonce": "0x6db124b895f9822d7388f030f3fa17d9af3a3dd22ba6297026054197cc98608c",
    "signature": "0x7675583b2c274ab5ea654b5f8fa6a77756a7707fa4ab878ab371d96d4a71787c423bec558bbdbb323ca71177438b5c197df06a59020a0d8ecb2175aaef427a311b",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}