Headpins are a Canadian rock band, founded as a side project in the late 1970s by then Chilliwack members Ab Bryant and Brian MacLeod. Macleod was impressed by the vocal talents of Vancouver rock sing
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 0x5835464d9a1b0cee514dfa76d672d34367c54f2da778ab9b3edeca90884dcb62. 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/0f53d386-1315-4910-b7b2-3fbc4953bdcb.json and https://artists.proofprofile.net/proofs/artist/0f53d386-1315-4910-b7b2-3fbc4953bdcb.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 0xe5a9e55320a6f1fafb79c5b82138ea643980410fb08ee834ec6635e278a03cfe. 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/CAS269900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac02ec98de9a0d01a17a85da6eedfad74ddedfddf55308accc59d28ee54040b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CAS269900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac68e2c08480f3e1025070fb8579973cb02c2b4ce3c696aec60586743d182b1b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAS269900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a9e55320a6f1fafb79c5b82138ea643980410fb08ee834ec6635e278a03cfe. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAS269900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8c90c5b4c921099432268905c58a149dcf31564f1f98bf7b8ce33c1f6e27b0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAS269900024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552033b3a9b2f09fbfdcbeaf7242387251dfa5b70e804579e6e3f0daf750e94b. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/CAS269900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac02ec98de9a0d01a17a85da6eedfad74ddedfddf55308accc59d28ee54040b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAS269900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8355a11fa910fd224ba3a4082fd4400ac85f3b88bf94df717ce69963a3b24886. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAS269900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432a83750a1958eee69c193e44372a113db00eda9ac3f6599bbc7e9e033c131d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/CAS260200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8ced4bf9a9c1bcc0f09c6292da3f79417371b9838b9fb5a47a0a2e144f1249. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/CAS260200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71af10364cc3e9345dde3ba8c4711e9846b83e685fc9950b8a36bf717e32e5e. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/CAS260200087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432a83750a1958eee69c193e44372a113db00eda9ac3f6599bbc7e9e033c131d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAS260200082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506b813b976b1f7c7ef38ed8c13a95f0cfd5cb28fdf862b910471fb1a3bf831e. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CAS260200083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef5ffbcd6392cd885ed9c407aa13941e584bfecacc20634f2968ac4207d239a. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/CAS260200084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8ced4bf9a9c1bcc0f09c6292da3f79417371b9838b9fb5a47a0a2e144f1249. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/CAS260200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd71af10364cc3e9345dde3ba8c4711e9846b83e685fc9950b8a36bf717e32e5e. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/CAS260200087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28a187fcd662cc9e972ec827e1b35e0cbfecae789a3c94d2c2df73584b9de5eb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAS260200135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8677d641dd3946aab9a7fd6e30951b249649d7b89e3a2f53bab7a249ff6f8635. 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/CAS260200134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb4b9759b4a7a7c41004dac41b72cfbb9d67bce1a4aa8744bef86d09538f151. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/CAS260200136.