thumb|Logo Mgła (; ; ) is a Polish black metal band from Kraków, formed in 2000. The duo consists of vocalist, guitarist and bassist M. (Mikołaj Żentara) and drummer Darkside (Maciej Kowalski). The
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618dd2e85d3fdc11b9792f69a91dc6dd07308cfe99df7f0f7f57b4eb16ad1cd4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a970e91-cda1-4586-8fdb-82ccdf1a0c49.json and https://artists.proofprofile.net/proofs/artist/8a970e91-cda1-4586-8fdb-82ccdf1a0c49.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96cbe780ba8960f537abe8408ff1068799ea9f427a189b623c0f9b0f9b81f5b. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2421202.
With Hearts Toward None III - live in Brussels 2013
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9def446b5b50ae216e11e6d29df5f197535d3e4d21d4f0ef30540ff0f73ac163. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2478977.
Exercises in Futility II - live in London 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7859b6ce8f2aa98625d26f95375076318556dd1658b64366de12779f573d58a. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2406209.
With Hearts Toward None I - live in Paris 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9549f540c436181d2de0849a692cd23063a6569b6f4c5d962fc4b165c64705. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2439714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3a202f28886d31dcfa16e77e25edb3cb78c01805fddf0f38027df10be958ec. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2419200.
Exercises in Futility I - live in London 2015
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722c6bf42a5fbaadc6f9c2eab8afddd433bc88855e2c947b02a89d6a222744f2. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2421076.
Further Down the Nest II - live in Wroclaw 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea73901e87f3daa098af4f2c59198415988bb6a8d46169a19320a0f202e678b6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2452360.
Mdlosci I - live in Neustadt an der Orla 2013
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc5867becb14eeb89273954f801f154517e7e98c85a498abd42f76aae457b2d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2427321.
Exercises in Futility III - live in Warszawa 2017
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf740e56d68b8ed9916ab955604cea9febf3b8a5ea8f00e286d392adabe1669e4. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2429181.
With Hearts Toward None IV - live in Arnhem 2013
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641ddde1e5d76107cb6ace5758363b41de9accd2d9e90e8a7ea82c1321d29645. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2416249.
Further Down the Nest I - live in Munich 2016
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4dd1e1e3fa0e2a4a665976132ff89a4ed07409e95f92ae42713579ffd726cc. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2425687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23682db4c2846860c2d507ec53950e42bd9f584922933e54fd2f4416ac868148. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2439184.
Age of Excuse IV - live in Milton Keynes 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b4910e72f4b9f507500390a443794562216b2530b4042e5a0c8ddc7b944ccb. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2499193.
Exercises in Futility V - live in Barcelona 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaaaf92dcd6d0f03c08777aa31cd4c7a9de671fb918f346af4ccae3f08635da1. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T16:28:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2481643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeca794eab09ff6573a4e2d775165bb06f376e08364e87c35e39652f82a0bd22. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2441145.
Exercises in Futility IV - live in Sundsvall 2022
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeaacce288053ace0038f875c0ef4cdf4b42cc6d68624f56b38cd447f944f6ef. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2436588.
With Hearts Toward None VII - live in Toulouse 2019
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93d5bbc7d0c0c0ccfff25f335aee17b33bfeb77a01c6cb67a104e529e9b47e3f. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2468701.
Exercises in Futility VI - live in Aleksandrow Lodzki 2021
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51156d707f18a56ba0e0521a3a83709ebc7995ca946e2848ce1738217a333fd5. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GX5MY2482509.