The Academic Male Voice Choir of Helsinki (, ), abbreviated AS, colloquially also known as (), is a Finland-Swedish academic male-voice choir in Helsinki, Finland. The choir was founded in 1838 by Fr
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa82e20905c0ee57c644700cfa46c2e89df84f3a3242767e4d27289966c47659. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f167983-0358-485c-af21-b74457dc0347.json and https://artists.proofprofile.net/proofs/artist/9f167983-0358-485c-af21-b74457dc0347.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66378ca6eba0557d37beabe15d67af6793f90685ae459de006c65f331c5062a8. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-20T00:15:25Z), 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/FIASF9500055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ede04b5c991fd71400a32ba15808ca8d7544a71ba44a59c283493547231596b. 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/FIASF0500005.
Björneborgarnas marsch (Arr. F. Pacius for Choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a43b924672353b79703fb62914188be35eaed4e5dfe56a015c52c7977c0b1ac. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:51:05Z), 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/SEAEQ0994290.