thumb|Dominican Missal, c. 1240, with rubrics in red (Historical Museum of Lausanne) thumb|Rubrics in an illuminated gradual of c. 1500 A rubric is a word or section of text that is traditionally writ
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 0xdf5ca1962f29b2da1f64954be01fb9f6ae35fe5a453a6f0934a26faeff7d78d8. 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/a67c39c0-7d67-4604-ab3a-046c70d016ef.json and https://artists.proofprofile.net/proofs/artist/a67c39c0-7d67-4604-ab3a-046c70d016ef.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 0x75c38e8cf16771efd2272f1bea9326a543abed73d9acae610ecb4e5bfb04235e. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/AUMEV2167334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd1e7f204ec7a6902e4d52e3c99d2cbe9aedbf2678d21e379eb7463087ca8b42. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/AUMEV2226096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853f9783f2b884fcee13c9a690e6e54878abaae4f1dd2b63f2a14df5e45333b9. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/AUMEV2226097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f4160997d3e98a5d4c7a0f3b5be366819d6eb6f96896516cc7006ea4ebf3b9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/AUMEV2226098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa265dbba50b9bbdf389f73ff03aaec9e058f86f6bef6d5c9db7589a0d60fef28. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/AUMEV2226099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a465be0f99b3de29de2d872a4d2b01edf163fa851b93c48ab4e065f638db9d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/AUMEV2226100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509beccb6bcb3618be689d7044d48c3ad5ee21a49b401000241d411113a8efec. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/AUMEV2226101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88417d906ccb0279793037b03cca0f71b03cca13b04a623be55ae80ab354137d. 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/AUMEV2226102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826aa7aa592ca9e6cd6bbd8c84f2ae5a0d01f0d0224d072cd6bbcfce8d802d1c. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/AUMEV2226103.
The Dark Knight, An Ambient Rework (from “The Dark Knight Rises”)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dafd07d5faea4ed1240ff73159d43fe404cead473c15eb7b988b71f93d41b9. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/GBMJG2506675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad6133fd7a52a9163d1a2fc5c4a3b8f1d8e1914b6d626ae3ef68744459607440. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US38Y2546937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446d3ab51e4c3186a9f3296700b778a59abed96f0dc6250350268a9345d06ad1. 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/GBMJG2521920.