thumb|Sin Fang Bous Sin Fang is the stage name of Sindri Már Sigfússon, an Icelandic musician and member of the band Seabear. History Sindri founded the band Seabear in 2000, signing with the label
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 0xaac82504a7ec92be6f25deb71677fb698463452355a2032107c48726528c312b. 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/11609cba-0e94-4f14-9d84-607f602004a4.json and https://artists.proofprofile.net/proofs/artist/11609cba-0e94-4f14-9d84-607f602004a4.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 0xfb3f27078ad4be8fdf8cc87e2bfff327b26abb50d9a5f9616f2174d3daf3c18b. 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/GBKPL2151728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58657c9bdf4ee46aade0ab2dfc238bfd90e70731ff4428f8fc69259de55c9a19. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEX261715001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354f2123000edc56ec8f512c25639e7bfd27f9e26728abf07f33fcd4c76d76b9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEX261715006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fefcb32921b6a985c59f89f682e9d5b61ebef52f653f995adaa701aad5c797e. 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/NLRD52250382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3070a4ae3a04438ec9dac7a49867339e1657bc5fee44e7cf28762e724c159ae. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLRD52250384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27ce0aca65ac77c95aeac8c46b98aa31fa0a58c1ac4547b80bd15a0d95518ce. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GBKPL2019763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cf1c13229c26cb1d259e0355b6649afcfb24bfaac34a11a05433eea6788d5f. 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/GBKPL2024876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5911ed3ce2329255cf8061de24fa2b09019f71e2af93a9f73feb8dfc17a0053. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBKPL2016722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0907dc2590d08b8b4eef8621592e22bdb95a624d1114f4b06cb4535cd7fc262. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:11:01Z), 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/GBKPL2024875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34656a5daa30d5767f51e88e5077d71e101117e9f8ae16283f643eb0084b2f82. 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/GBKPL2013173.
Flóóð, Vol. 1 (Live At Iðnó, Reykjavik, 2019)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c84e83f1d7ae9e6fe2df77adf0ad78beac5186e5bbc9b2fe3e42fa8a430508. 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/DEX261614902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19e3902f1e9d089232e8054b9a3305cd24d972515b41b8993c3eaa477f2ad33f. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:48:03Z), 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/DEX261614903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cc60657e06f81a3e0f6cdeba97cbd47725bd4381a30f2c9539a3e3d69f0abf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEX261312001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65c3f57b819c5e3ce1d34f179cfd7aa0eb801b424299891519d8eb930b401bc. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEX261312003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522e46be1a6a062735b9e390a49bdf886c78307bd94a68614ccbc1f0590e0c3c. 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/DEX260908803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56582e03b9027da793427f73050dba308a4ec976b905d9fa8c015f61d23cf059. 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/DEX260908806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da1366b2634221f9ec0e0c5fb0a4eaa03edfb6f08db6725c6aca8b65c97d773. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLRD52250367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd017c2ac7ee25cadbaa7b351bedc52ff036414494029bee94e9c8e13d2fdf8e1. 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/NLRD52035843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ddd61f612e97602affb60e86cb44f62a3e00fe39c61822084d65b78c4567cf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLRD52035839.