{
  "manageEntity": {
    "action": "Save",
    "entityId": "75491237",
    "entityType": "Track",
    "nonce": "0x9e0d4b289728820f9af86cee640422c6c911a558e8123e89c6abc20a86011eae",
    "signature": "0x3dbc8c55b6300fb8e94cf8e1e23bc5424dcb6bf2b77c51ca332bb89db89c76bc0e76486ef6281b0b0d51b8b33e8810b9109f12885333477424535f59a7f499d11c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}