thumb The Fretless are a Canadian folk music group based in Toronto, Ontario.Mike Devlin, "Folk group the Fretless feeling ‘super lucky’". Victoria Times-Colonist, October 19, 2017. The group, consi
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 0x8cf28e1922dd3511dc649ca521777051ea866e8b1ecb464d1d15e3fe0e8ee9c8. 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/4b928dc2-7c1d-48f8-a32c-e3939793eebd.json and https://artists.proofprofile.net/proofs/artist/4b928dc2-7c1d-48f8-a32c-e3939793eebd.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 0x45ae6ed992390faee53fec8fff3b4c2006ec3cc769410bdcaac9d997a5953745. 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/CA72L2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e56352c3d39d402e4eea70e7f33075371d46fb2d668d6ecad977dc3c17335c5. 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/CA72L2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b3d055fbc75df0204184bf0de03318ebe5d8a37348221273b12b0ca3261f9a8. 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/CA72L2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8000b19638bec96906ea3d3191ef59e5199695d1a9f270f6eccec396bf82b3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CA72L2100003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4b2318fbc3c5298bd7a77336fd32cadcde0c18c7356605f5585860d0b1b9ad. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CA72L2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51d7e9582b2148449a76cdd5ff6444949ff4cbdf5b97ecc4472553c93bfc183. 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/CA72L2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cf496a82224f7dbbd177b7ffb24d651627523d72e7fb620effd767ae3e5da1. 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/CA72L2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f9f390363bc4c12bbd21f1f5be44251dd2e0b91260936db029cffeac2d026d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA72L2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45ae6ed992390faee53fec8fff3b4c2006ec3cc769410bdcaac9d997a5953745. 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/CA72L2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e01847cfc48e2ccff4197d2f3ec685408046d434f5d5e3f516c7279e64433c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CA72L2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76466a91c5b3c6383dbd4135143a91c7f0382235ecc99c6056192d59b7e52930. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/CA72L2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cf496a82224f7dbbd177b7ffb24d651627523d72e7fb620effd767ae3e5da1. 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/CA72L2100006.