{
  "manageEntity": {
    "action": "Save",
    "entityId": "751757707",
    "entityType": "Track",
    "nonce": "0xf0512ba2c59708c4c17363535107d7e54686124a0882de3956b3c4557a531541",
    "signature": "0x682471681f069207e6c5f533a68fe9a7c4d2c6795ce1b6e340d8177a5e5c4e4e7183a1d14ffb6d7da13b303b9819d3b699e3740309c0d159b520fce5388871881b",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}