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 0x4835a1a61e6045713341610c971264b5382746fe2a3451ae2cc754cd8f24184a. 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/d12733dc-055c-4f29-9327-84cf38c226e6.json and https://artists.proofprofile.net/proofs/artist/d12733dc-055c-4f29-9327-84cf38c226e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Guitar Sketches for Rest and Relaxation, Vol. 2
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 0xab6c8516313d4add98cebe3d016b0ce534df451d3d52cafe1198993092062253. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/QZGWW2014302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc2e6424e55f304344d9d87d3d1ef1c76b5cc117f43e4681d9b1d1ab3a3118a0. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZGWW2014306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fee385ecda0c3a2251dbd4863a0f9801468e2b99b0eeec833fbb5a80b9eae20. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZGWW2027788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a1a90f1c59e1d4a7988a554eb04cdd355b0e25d695566c08ce496d7225d8d9. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZGWW2014309.
A Fingerstyle Tribute to The Beatles, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069b265091df818e021177cdb8fb38e64ca2e58b22dad01a23981f36d5d89fac. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZGWW2142060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0351cd72bbe936dd7b6ea3e7f35a755764b29253c1c86a2f9b6e2538807414cf. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZGWW2014303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2104cf4774237045567776a21b6e4e30b48d6d45d35d4b3d9899d772678a5fbe. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZGWW2014301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c96dec0fcbaa6949a032f45001ad6ddc201f0322e7fab13d05e4c6d39d07e5. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/QZGWW2031289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7a8d9a3b513515caea7fc8557960d32af570674c7db6c1991b650c1c130b81. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZGWW2027787.
Guitar Sketches for Rest and Relaxation, Vol. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec3c3f4a5795b2a38b6b5d07e5b6bc55c2139a635e9d7092bb49c0254ed1e88. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZGWW2012792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90428471eb4817cb2ac0b5cc3f21fb740824703005781e0fa86c129aab4d45ee. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZGWW2027793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfa8562675281571f97a9ae023ee52e25a3d5c9fee134669f94d5270d9196c1. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZGWW2031280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9014871abf376c1ec47ba68f3419cb119291df035398c1bad397a21e6f4cc61. 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/QZGWW2014304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc640acb7ecfe75d262ecd120a081f62d9dca1575710af724ffea000239598f3c. 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/QZGWW2012795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63119821e807ca78e36829aee88453f80d5c697592a97971197b6dc08bb5cba7. 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/QZGWW2012797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4d7f721eb59fce6a84b4e368232c94c2fac1cc0a88f7540333f9957469e052. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZGWW2014307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88078d0d84ee80aeddc342ca91d888c1b3f611b9740f7e9cf590526eb4179bcb. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZGWW2014311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f34923194619869750d90215e295625d6890b2f59e9e82ce760444fd9f09870. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZGWW2027796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c0c207eb83af2d24388eaa611cf6f64388c44200c491cea4e76f1d61fba652. 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/QZGWW2014314.