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 0x0093635d2e8c93afb09a587b9bbf89fe44927134f02217af2fa92059bb3b9fed. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e477c317-0307-4716-a5f4-4b340611ff9a.json and https://artists.proofprofile.net/proofs/artist/e477c317-0307-4716-a5f4-4b340611ff9a.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 0x9c0237b45a516fe57bc0ff9758fcd0bef330515b46bcf7a8d0203735e540175a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZMEN2341810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3582a68202771c4c3e05c3c70f5e8f1c83ce6375a9269852ba7054d48c409042. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZMEN2341811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3afa69940e910d0a576f779c1bfde501b1e9fc7f636740a0cc791d75d09c1aad. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZMEN2341812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2473886b695dc49515a2c1838ef1c2b20461413736a9644c85539997f31b56af. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZMEN2341813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20198e0ad679c9bbff5b51088544348339ed5c0cdf47f00d91a4e7f504579dde. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZMEN2341814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef997590c700b8779240eaafbc782730173ae416054c15cfab5df080bf6af83f. 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/QZMEN2341815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b49691154ee61ad2344ff1b190da4f6b0afa67efb8094eae9c96a960bda8261. 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/QZMEN2341816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa69fdf7fdfe4c708084b3a74d7424d27e27a40c8bb09765d5ca31374276c32c. 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/FRX872156943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf205e8894d024924892e8fb37575c70daf261f14f9f0229a16e52bc7c57b3707. 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/FRX872116500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd1a06ec12ead70b8aff42627a5ac7c3a89cce08c763f7d469e66da41adc310d. 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/USCGH2490948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ba14d6ad7288ee1a1947fe03f58cd5990001bfed7ebb77ddcbaa7cc80ad857. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/USCGH2490949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c46ffd007f05aad27ab2e965f67bcb48c6a3055aac7c34b3c6816934b007b56. 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/USCGH2490950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x031858c475b548ed6d570c2b0f9abccabf5d2283b6a7164d27dd336957c7c6b4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USCGH2490951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce32e81bcd3f1cf94dc9943af5f8c83f931a7f52a34ca76af6a5004d3b742147. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USCGH2490952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090bb931c04c8b9afb1db9e45086ca70ee919a5f5537002b80edffca01626a96. 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/USCGH2490953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff58785b4be36cf0001c15ab5871a075938c1c30c6d624a091d09b5c1816be88. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USCGH2490954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b467f5291d08149c1435ab042e0b7355daeb4a9da7583c40e88126a4eea6731. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USCGH2490955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd2ade01f102c028027d0f955a31fccb2324ce496b7f75267fff4ff1945f7bea. 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/USCGH2490958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68de7664526549e4866e111479bb4522311179310cb406c27b5f6e86a7ac9df7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USCGH2490959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f316bbfcb0b28921b539f3f5273b658e683b63735807a90b451707172f3f84. 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/USCGH2490962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010bf77c2d5d73103bf1c6c248c77bad0ac17b5ec63317901235d874f81ae8e7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USCGH2490963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f7967b80c36752bfe4732154b955a563ea2afabb495b77c30ecf74f24f7eec7. 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/USCGH2490964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0351ced8451686a340b51cafc4b77be083bd1ba80be9c15196394b245e1f15c4. 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/QZK6Q2514075.