Artch is a heavy metal band from Sarpsborg, Norway. Initially formed in 1983 by guitarist Cato André Olsen and bass player Bernt Jansen, in 1984 guitarist Geir Nilssen, drummer Jørn Jamissen and vocal
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f33382a59d074d229338da5b1c6492f31ca6093329869bbb27652d6f1a486c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/550f36e4-0d4b-4095-b87e-1599363eb05d.json and https://artists.proofprofile.net/proofs/artist/550f36e4-0d4b-4095-b87e-1599363eb05d.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cdd4b8ca96c2fb5b2098b1e6bcc4be30b0c1b0a79a37cc20cd931c67bf86369. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEYOK1308607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4c299dbdd5d08af8261482845a2b33704f086e18870ee927de426d5bf9e96b. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/SEYOK1308608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3ef0d10b96646abae82120a75599aca4b393dcb248b663c8aa0c59853dacc. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/SEYOK1308609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1fba4fcccd92ab6abf259609bcd8b09c0fa2f22f6a1e7d924cdcc5e5bc11078. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1308610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07629e3b3be19027d3977b088e5a2c7bf5c6854ce110d493b9e3723fb7980c5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1308611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6038e4a703e5551c67c6f3973aa7a146a37b4aea42f924369980ed34686ab9e0. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/SEYOK1308612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f3c18b3ba34ab84cac08c678da839fbb3dbe46d86c11e4f3261cd64a9e08ea. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1308613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b8108583a648050b7a808704d27f2b543092039da40f0a48587aaa51ad9b02. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1308616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e5a2e1b642ed3d6a8acd2dd5751975a81f915068a354110d69b87f123eb32d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEYOK1308617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86f9473a8fa0407b96f8bd15ffaa4ab59be70fb659f9047270f5a384fb32a40a. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/SEYOK1219783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0aa594e69aa170ae4adca1a6aefe8d9e888f2276378cdbfa4d9164a797a768. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SEYOK1219784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd455f9ebc53046b28946898487ea81c6b38d27a6bbb0555acf5cf7b21a5421c4. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/SEYOK1219785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cdb639906ddf539008bc04638430a9d0c7fc246fdcc7c073ba39d207a9b7bf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/SEYOK1219786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6def746a949ba76a981399994b0fd2af7a4efdc72d4cd02b6c0f306b3a942759. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SEYOK1219787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791a76bb65f9a15ffa6fffb1e64e02b495c8326211250e44b717aa054567fcef. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SEYOK1219788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x249dcc33134bfac4b55916dec25db50525f3dec5a08c1664c1261e0b52bbe962. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEYOK1219789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2853196b5b27a37d3ec2c8488373394eef7bc76b1d742b2d3cc389f78a26209e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SEYOK1219790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b843fcf5395f8128bd6cb5bf8c0bbf24d0689e204bf7bfe78611712e632f52. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/SEYOK1219791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89dcdd746de1eb277fc122312f51feb91e2ce584f647360f8a8e81287ed1629. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/SEYOK1219792.