The Duhks were a Canadian folk fusion band, formed in 2002 in Winnipeg, Manitoba, Canada. Featuring banjo, fiddle, guitar, percussion, and vocals, The Duhks blended folk music together with various Ca
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 0x61b42a9d6eb524da0900bca241ac6d14e869f2800146079f523b0e1db97fc361. 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/074a3b36-9bc4-456e-91e4-183fce920b73.json and https://artists.proofprofile.net/proofs/artist/074a3b36-9bc4-456e-91e4-183fce920b73.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 0xa1f0481a86cfea55d1c3974d45fb98f3e6595691edf0925e72165ff569099ba9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USSH50403458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5bc7118b49b9958bed5b725158b99575ae60ce94c2b49c5574af3d991b21e1. 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/USSH50403467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f127be45993139b53001b2a2c49023fc40887e70daa5e8bc44d76bbbe00600. 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/USSH50500274.
The Seine River Waltz, Anna William’s Reel, The Newfoundland Reel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005ec0dde4b35e14becfa3b46042d46ecc743a13de00608ab499a2c9f040e0ee. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/USSH50500275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adde3429c859830dbdaa7cb4522fbc75790bc14d81f7efc8136c1cf1b58cd53. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/USSH50600369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbe67a44289399c4f9fbf9a2df22406bddebfef7808f9eeac6a6f562bb9d06b. 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/USSH50600370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723f532f08ff7ece1dcb4cb54c2b1a8344c056f7986721f6b1004366ae513b32. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/USSH50600374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53e1d0eefd040630620a0d056dc23be49cd794ad761b197ac9c07d1f78b4465. 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/USSH50600376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20005cfe2d6184f8d1afa0e6abce6dd2ce96a5045152419980874743f3fd8e99. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USSH50600379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfa1180ec2bbb2978533f8b7ab482b6f3824adb507580883d18f6b5dd16ac46. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USSH50800911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559b9a874a137d808480f13ad05ac4a3648536e6bfc94d805550af23e3587e56. Chain 2 (Bitcoin): anchored in block 959052 (2026-07-21T19:50:27Z), 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/USCO91463209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0de5fe2809f896fae56779dd7672c644e747e51d73f8e94a420922d45c7322c. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USCO90541103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f55f226a68d5cdbd62ef50165d796158331759ed80a539255eece1a1c3f71f. 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/USCO90849005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8860ea66d171c5a1d6386204d275bbc0c99a682a928fb1d6801ca8ecb06d7172. 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/USSH50600373.
Medley: Duhk Duhk Goat / Begåvingsmrschen / Le réel du poteau blanc / The Midnight Visit / Katie Hill
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67684281c0e76bf26d038b58deb098c33a847cff9d49aa308ae4306e756947e0. 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/CAD1R1600011.