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 0xdef52330a78a0a1f88b34e8ffc1a2104d364c1ee1c8f7b8cce9d70e7dd232754. 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/dcfe7c39-d88b-41a5-8fe1-caa672640ed1.json and https://artists.proofprofile.net/proofs/artist/dcfe7c39-d88b-41a5-8fe1-caa672640ed1.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 0x52ef8cc5118a49ef9d780370a3f3e100c21d902d820255807a9ecd55a8df7bf7. 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/QZSYP2295533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfce0a08ab35317a2e0edc94ecd24e62cacb53560ad837f8ac07f9e9ccbb56b2. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZTRX2319973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7634b2d89e68cd4d94f17f0ac03e9b1616dd8fb414e1b9ac33c090af48071b7a. 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/QZQAY2397069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568e0ec2c5a9bbdd8fe698796741e5e0c368c481669b6ae9cc808543a3c1807b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZQAY2376742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986a76ddb897aa48353ac17f221a91c6b88bb15565168f192397ef4c5db401d2. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZWDD2314505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468ceabb378c2b4340fda1e73e312320f4b904c13132c99ed57a5d5a4a674436. 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/QZQAY2446121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df0ad992635325785f46a9783e93a429068da018d762d94093eb26603562894. 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/QZS7J2546081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df0ad992635325785f46a9783e93a429068da018d762d94093eb26603562894. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZS7J2546081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a87988f3573fee0aff0342ee3edbb7733739b22f5f93cf0f03d9833959dc4c2. 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/QZTLA2508961.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b44a4f59eb8bddc5cafd8b1bc88408bb5375f2ceaaeb799440ce03ea851580. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZSYP2505297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1eeaa005d9f468380a8947825c30a2db3162fa6d4c78c17f275cb5141d7299. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZS7J2573661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688ced4333098840beaa78d78d57486d5151f808b1c1cb456e53c29e2dfcc958. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QMDA72285970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4f167a1214822430cf66fd325d4ae0aa80a0876ba7dab398c4ab9767fe5e8a. 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/USLZJ2336073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa973994546eb92338432c95a5e50e34ba0cecc48f45d5fd283fbd247ceb2bcba. 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/QZWDD2224367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x980396955cbbd03f35caf1cce30abdc8bff81509873a6e2a1b1ff27e5427aa8a. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZS7J2400988.