{
  "manageEntity": {
    "action": "Save",
    "entityId": "948298",
    "entityType": "Track",
    "nonce": "0x6594045f947a6a435ad49eaee32a4e483eb77b9eea0b441cf7da7e65ce885009",
    "signature": "0x4b07c7a627f8dbbf37db8a2beabf3eb872ae5de47bc2a3623c1831cc799c6a1a42e75f259072f2e15c3e8824fadc0fc096becdff7f085be1cbfeefffd4b947731c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}