{
  "manageEntity": {
    "action": "Save",
    "entityId": "657011",
    "entityType": "Track",
    "nonce": "0xb34e876e294e432a08dd3aadbdcacb3d670aa5ecd8a73b3d04ca6af548826111",
    "signature": "0xc5e8dff869a92ba234b026717ccec81b95593e896756724b985b5a37908bb46900db5cc6982ecdcf7554c4a27d352fd260067b47f5bc7e561d4b2b154a6250121b",
    "signer": "0x2f6C18419818aA0932B2906f3749322D1CFEd35E",
    "userId": "719970451"
  }
}