{
  "manageEntity": {
    "action": "Save",
    "entityId": "548310939",
    "entityType": "Track",
    "nonce": "0xbfbeca46bc7dc58c6c505effaef5d8d77655d0d75db2c8df330e705a7c32856d",
    "signature": "0xd0abd52d1e952ff1a51e1af58b2b81afe16288feb843808581ad20ed805e7e39141a0f2c3aae15e0acc2f09834ff210c2685fe29791a023262fe1e72e4d89f401c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}