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 0xba08f2221af816c1627cf3cf2d60775266d5bd7bc1377917f810dc9e6c934457. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88ded1c2-1782-424e-91dc-9639f7b9739d.json and https://artists.proofprofile.net/proofs/artist/88ded1c2-1782-424e-91dc-9639f7b9739d.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 0x51f5ef8cf70aba960646aea0620831223fad72cf04d1e086b793ec1ae6bb58cd. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZTAX2456800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ef5d2b748916c46a1acb6cb6f4f26ae491f5eae52a439e7597dec8fba27313. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZTAX2423921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dfe22b928ef6a72d944289293aa23f40d32f4d2c29b006306a60b2b0d11083c. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZWFG2487149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b06327bf2d1960296711dcfdf455e4b6cabfc90182d2336ebd8864aa99f4906. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTAX2448343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926e3b9b7ebfbce56a424e1ebb8f2ee95abaceb9142fe297389f7b9982512fd7. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZWFL2464480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9ecad8ca726750dd7e634a83e243357c8fdfdfbc69ba7150223f13d69f103d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZZ792469609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2970b250041882526b613fa4ae702a2d16cb5bae94b73adc1482ba94eec842. 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/QZZ7Q2493532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff60ca61713a6390edfd595cfdd29c23d43b5abe25399854238ce8bf700154b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZDA52513609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62599d34a7f978a949132da237a51240619101497cb755980eee70b86acc7367. 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/QZK6P2594076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9df7052a70dc8dff773fc4145de626ac20232d91ba21765a97733d9a5cda4a. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZK6M2509245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392a5d0580fe4eec87a8d0631a8c31ae6963c2c61585c2fb25622197157eb891. 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/QZK6K2518670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53f56a2b07f9230dded6cf64246d0090c92c5b147a5f317fae80fbb4fc61ac2. 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/QZK6K2553374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82c959d463db73f3b7ea113eff281ea1ebcfd729112d1805eb0847086fa6e8ee. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZWFQ2545947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9be389987d575365fca74d14a6d7afde25466c24480a645224d31acd8607b1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWFQ2559193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3df89f860f9deec89f15695ba0b9beeb6aba3dd8f8d26432542dc5d7dc976e1. 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/QZZ782536325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25618e6b3660beb46a061d1b41c48c90ae857bd6cc4c39176b4f42acb4a243d9. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZZ7W2567731.