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 0x1327a6ec65085c425b6c1ad46a9a1f12473b1b7a7c1fa0fea4ed0fcde0e319dc. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7804e3ee-6363-4a7a-9131-b919874a98af.json and https://artists.proofprofile.net/proofs/artist/7804e3ee-6363-4a7a-9131-b919874a98af.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 0x341c75601465a890bd16995ee9cbc02f7ec36bb6114c7509db28c21d84bcf40c. 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/SE6HN2374017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f201fa6b3a505afb4c0b3786e3a79496bc59a15d845acda8067fb9ddd7f87a. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/SE6HN2277335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccdd05c6c5588a89ef3720dcbecc5b67325e1716c77bf08291cbb7f7eafd2dd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SE6A92160341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4976461be1fe17ce5569957eb042a25f4024db4671b81cb496855a65ca132cab. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZHZ42051438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017eda066c6bd72b5716d154cb86a1f14591c07edbb61d325f6ebab35eeaed84. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZHZ42064087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1453799b1663cf92c9d4f4dbc87a52967d3fbd4f6dd3bf82a514656c739ef8d3. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZGLS2013545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22df7ae69483bb91092a38f35ab2c087dc710f5e419c51a422e8c99d51143682. 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/QZGLS2006529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed9184926bf2407474daa5e0ce9d8f6974b0d0e6639f7f29a6d20292e7f8e42. 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/QZHZ31953447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4eee345cb1b55a07e81c3a7f0b7546f5d8dd8202d49e4f2817034b9454dd4fa. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZHZ31943529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb74b083035e617e56c20df459781b0da8fea8dcf7e0c93b0af95b6a46a71581. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHZ31935815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce83e90884298571be06fee5fcbd3dfaa1b4c824b5d7e8b1a4d03b9e9b098d78. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZGLM1957509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c00be349e8c48d554a43ccb4be15ae988f1d4d0fa6cd1763f0540079559c59. 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/QZGLM1922682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83fbaf2cc5126d57484443d1a03f435f93a2c9b4b0cedf331f389909516cc7cf. 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/QZGLM1903115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664ec2eb344f59c3a793d63a9139e79751a66106ccd38c8d87f0aa9352e32de4. 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/QZGLS1983556.