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 0xc38b682be26dc4d5caed498615904427084f4f16a03f3b4526e68293bc015d21. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8652f1b4-6234-4171-abd4-48b2d384a070.json and https://artists.proofprofile.net/proofs/artist/8652f1b4-6234-4171-abd4-48b2d384a070.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 0x47132eb713915337046b4ae554e5b10f7c2a313cd1a452ea76d739587694e82c. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZYFZ2437330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa303974ef2bbb28b8a3645c4802f71f5a6fa09e93b751b5029bfb488bf4463. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZZ662459758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x174459b8a3caeaf2aac77708802349fb30fbb374608c13133a33c5c65001a03f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZHN82421351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31fcf5c0bd6de38b6c656a2f6296136ed380a24be56e29177d276e9a142e532. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZZ662361354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1dc128fa9621c1ef155bb13285072bb233c30faebd0a82da0618f482bf36fa. 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/QZZ662346844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x722a3690e14c36775ba25d2e0a2be9778e04ad00585398062a907e3a8a2e460c. 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/QZZ662315519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130be45ee5c8f8ea46410058a74b744f54b46ad4abf13ffc31e365a788a31978. 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/QZYFZ2387572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4726e845c4e24e4bd465bb16ec619bf50ee2df1c8e8cb840d7054a10c0764e5. 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/QZYFZ2342039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85368c9e47b1a5eea2e2b35368f5f2e3b2207cfbe40f8465de0b697c3450b8b3. 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/QZYFZ2314643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8929dc7124bda412de84fc711f1705b1affb1b44c36c4f2120539a180c2bdd02. 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/QZWDW2385626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9322cfbd943ec801cdfa705c9c0f9df7aa03027e65ec9565cc47aecc0cf470. 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/QZWDW2360747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74f07fb1d974bffd2b29c742407042a0282d7aadea6d799e7b098748f2bfdfd. 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/QZHN52395658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ae7da3081d534c9844185eff895f4bef2844aef083051b85b981d36e6af080. 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/QZDA52355869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68831ada1bdd38c54f625545637e38c555b64717043beef82aac83cc2c287299. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QZTAU2274562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b14867e72cfb3be818c82fb2489f89e0906ca4c405683326a04e745b3a070c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZNWR2278850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e852976d133383f409ba0ecbb515403d5aab9c22f4f262ba17ef477e65df566. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6F2273499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37113fab00a64c0624061fdfadca0412c21770b0cf9ab0d1ac0193f6bfaaed77. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZK6M2280942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d249927ddf0dbad0614a5cf4d6158705e6d736f804bfb3a5f631fc073bcf642. 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/QZTAT2141319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51874583d8805a1a9921fe0c4bd08774ee07db84b751fcf1205d7753c5af9c2e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZWDW2411031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71113c68fd9495ed96acc98863dc5978ab47e3aa750e91c90192a875b0bb74f. 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/QZWDW2411032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fe4006ac2760bf822f142bcd4d18baee636bf7ac8416ab51ab0eca0a4139053. 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/QZWDW2438444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f0de67025d9bf38cacae30abdc08edd146a99974593e4b001be0c484c5f6f2. 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/QZTAU2330190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d750e74d296c54a2ba0af6d4e2672a8ff6a5a57caac54c411f03dafc4f4b1e8. 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/QZTAU2330191.