{
  "manageEntity": {
    "action": "Save",
    "entityId": "990874022",
    "entityType": "Track",
    "nonce": "0x5f1f7335907f9d0c68a19799b9e01ec03d4578a09f98224570ab49d64486228a",
    "signature": "0xcc7cef0dcafd568e50a15ec3c63559d5f288a78fd6544ac03fc602b30aa460b947441cf78d35b64d64ef35de8565d71bfa3d8c126794b3a13190fd3ddbcf4f8f1c",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}