{
  "manageEntity": {
    "action": "Save",
    "entityId": "703878",
    "entityType": "Track",
    "nonce": "0x05673970e3e8afcb0f66e908e6d0fa7349a2f7043883e40e0aae166211561e67",
    "signature": "0x8c6a77dc89c696d26aabde3935d6752d1e6806c849eb12e5a3278cfff377a1fc36209dff5b7022f82b3bb308e73853926405bc954c7fcfcf75b7682297a520471b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}