thumb|right|A former warehouse for printing presses converted to a loft apartment on Chicago's Near West Side thumb|A US-style loft; the additional story covers only a few rooms, leaving one or more s
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 0x86070f91c1ac371d6d0a224949a1960eab2be8b4ac9e0bcb63aab1174cc60957. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10531f4b-2a28-46ab-829e-98a8800402eb.json and https://artists.proofprofile.net/proofs/artist/10531f4b-2a28-46ab-829e-98a8800402eb.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 0xfd0ad52bf145b427a0a031dcb160b4f70e2a49a112224f1aad704eeee597ae1c. 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/US3GD4276488.
Butterflies - House Extended Instrumental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c124020d0e6b0fda2b6a679399da7fed0e0c0ef947a1f317a7f56b672695af. 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/US3GD4276490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c4a55fda4dd11abcc9364d6f1fd749219e6f0bea05476fc1ba6ada688fdd3c. 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/FRX872103901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7115f001957c710f6f90139daaae1d5d19d977d95daf60751f3e3f94ee8aefab. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/US3GD4378977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e26b60784a096365cbb078da1a606d9deaca51c39c05ff3b8438e6a37f2a23. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/FR10S2211805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa83ff083c79d893fbdb9fa21714fa746282ad70a137303ed8341ca626463eaa9. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/FR10S2211806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180c80c881417545652f7a60ae5eed197e3e1d9e41c5f12c4706d5e403045791. 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/FR10S2211592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a542af37fc813a4a0aa8802b0913ae1a337e5f35514127f7196eeba341adde. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/FR10S2232016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ba70b14992a7226a331e96f1af4c25d4c18e0f93be2846a59915419653b9fbc. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T10:57:39Z), 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/FR10S2232019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af6ac7f70055d65e69fd52ba5d010beac22ee66b5609e59a29a2833d2ceed1e. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZES62253611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df3f3e17d335ab85328301b4d265a5fc8403c9a487a9c58d4186904fe48627c. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZES62253613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374f4b0d099b19d768ddefd6ba8c3ce6633becc25b80bef0665e3e5e773212f2. 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/QZES82298679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e133add7c4af5cd160b1fc6db6526b3dbfe0c8e67bb4bf5d23399edb255582. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/QZES82298681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x464fbe9dc2dacff11c9a0aec94a0e0c49dd818d4a41477a289a91154d94cfb97. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:00:39Z), 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/QZTAT2238757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13fc4f276459c3c956974596437e13167c69beb5921827866fa27a5948ffce17. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZTAW2237684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee03992c5ea1f82471d1092b10717d7a417b7b03702dc7ac59091d79202ab4c0. 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/QZTAW2237686.