The Sorrow was an Austrian metal band from Vorarlberg. They were formed in 2005 by Mathias Schlegel and Andreas Mäser from the band Disconnected and Dominik Immler and Tobias Schädler from the band Di
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 0x9a477f5622fd98feb62c054883a43c94ba47b9d6c359820a50102dea75e2bb91. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42bd2348-c504-43e2-a4c0-1548cd50711c.json and https://artists.proofprofile.net/proofs/artist/42bd2348-c504-43e2-a4c0-1548cd50711c.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 0xdb1c8eb8991998f0c74369879249ac2b6d03de09070a989e6f01fe97f97026f0. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DES370700063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1efda92637624c5ac9fc28ddbee01867910dbfbc30a5f8cc632a397a77a50094. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DES370700062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ffdf0707d278080eef27cb42e22922434fd3bbab39221d747ea54903c287a7. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:18:19Z), 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/DES370700060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fac0b133050aad67cea057590ce3f63c0456d9e74c0b65ae9a7dadd939dab53. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/DES370700055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2192b7b80d1dda9b560ab9877d8cebb84a4c955d051eac84c8db40eb24a8a2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/DES370700059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10a80fc3bf3d05358905f292e7937671717c6d2130c45d19db633766057bde8f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DES370700064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc70e820d8703a9234c14a3b648c996a156c9dfd4acec7e03429d867abe29729a. 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/DES370800155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f004232aaf5f2c155f58d96ff1b228ba680f6b14adf553d212351167c7c80d7. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/DES370800156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa357b6ded4349ee803d21615306270623e21d14ecb25692fe3b417f19067271b. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DES371000334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabcc7cf0f296cd9c1d6fa4cbe026e3c282db1fe7135c8b44fc5c0b7d6d1f5409. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/DES371000343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1358cec82bdda1741fb2807fe48308c10d61f61b9ca5dd890fb898b2258250. 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/DES371000339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b29f2432eb2c7d82533941a939d7e6960c8e7410899b4dd41faf4b4e8928f3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/DES371000340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cb62377bfd3b76ec59fb05121da9ed3fb2bccbbcd67623680862d0c6040f45. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/DES371000345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd657de86a51bf6e375cc92d994a3948fc1b77f0c91df64ad36c403602702c8a0. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T05:00:54Z), 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/ATN261245202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06d3b0def4f87dc558f9d44788892348d1f4f673b009278a65d988dae9f1220. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/ATN261245203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ae0945c4b2e31a5a1d8eba201d193c29d9881433904be05d6147f8884f4602. 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/ATN261245204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5220f1f4524158488e1d3eb2cf48804c9ac8bdc92fefa2788d2a0e83ba8fcc94. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T19:05:22Z), 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/ATN261245206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0f9167a86c2a137e88430abadbd7b1112c969a1878509dc25d973690e659df2. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATN261245208.