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 0xb78bcdc496d19bd279ff81512d92ae70c18eb0c8d731fd913ffd5b707f201c43. Chain 2 (Bitcoin): anchored in block 953918 (2026-06-16T08:55:04Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1aaba0e3-5800-48dd-b712-cec675911d43.json and https://artists.proofprofile.net/proofs/artist/1aaba0e3-5800-48dd-b712-cec675911d43.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
King Arthur, Z. 628, Act III Scene 2: The Cold Song (Arr. for Voice and Cello Quartet by Josef Hofer)
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 0x06e9335803827fd5c701e597f5a573c367bfe22244ff5031eb29db3453a173be. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/BER182279701.
Dido and Aeneas, Z. 626, Act III: Dido’s Lament (Arr. for Voice and Cello Quartet by Josef Hofer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9283140dd0a167a7fbeacb7b0150a8bab22e64bf24bc1f159ac665ce5aa6df2. 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/BER182279702.
Matthäus-Passion, BWV 244, Pt. 2: Erbarme dich, mein Gott (Arr. for Voice and Cello Quartet by Josef Hofer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f919dfc377db28d23da84a8120d5e1ef74b32b407c56af19bad52e43560f9d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BER182279703.
Carmen, Act I: Habanera (Arr. for Voice and Cello Quartet by Josef Hofer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9847b5a8e6c272b8d29edccfe3d8b51a0c91b8b92d6f2c7a067ae73e480ae74d. 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/BER182279710.
Oblivion (Arr. for Voice and Cello Quartet by Josef Hofer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7697048a25245b8daa9c24988379774d11dee55e0d3ce25c74a0fb304ed4168. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/BER182279711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe2eb5e0413b0dc00cc08101daa6706a409509cefe635ea833d26ab258f0b40. 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/BER182279712.
Over the Rainbow (From "The Wizard of Oz")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x215c76ac992a32961a6effedb14fc29417317efc1dd872d5db33531b9a2dad41. 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/BER182279713.
Colors of the Wind (from Disney’s "Pocahontas")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe6c113fa688ce91fa46855bd3a3855646087b2c63ef1b9e1f1f5b89936da8d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BER182279714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722a95a2838390dc4714da2152f1b9f0499570c68eb33021a15ea3ba729afb87. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/BER182279715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae84c4e504fdfa6bf69e8f35b886699d995da4def08889f1315f9a68d18ad528. 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/BER182279716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7c6177fe16df9424bbfab297fbbc3dc0f93a584f89f74aec3cc9b5ac386855. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/BER182279717.
Toxic (Isabel Pfefferkorn and Cello-Quartet Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa58ea4729a35433e4c64caa15d7a085b645f61bdc44058a10b6a3ab73f4bf529. 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/BER182279718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc3511330993dd8052296d0e4a661042dbad5502c9d0da23afea4d59854a7d3. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/BER182279719.