{
  "manageEntity": {
    "action": "Save",
    "entityId": "703364294",
    "entityType": "Track",
    "nonce": "0x3d48a77ac232bfe6f4820fae263b8d50729029013253e0b4ac0806089fb2366d",
    "signature": "0xfad2cc78c84b196a6feb2f82de5b4f58587702dd2342b6a9162717e98178a7a2135a3cb4e5e4ba1fac9dd778975134f27f18fe4e54f54fd4616b42a0ef80e8e21b",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}