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 0xcd24f908d0e6f8a432c1ec5da8ea594503fab1d7b16b3deb3d0951c4080980fc. 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/893aff61-56a0-4ed8-8674-9cd53f322d89.json and https://artists.proofprofile.net/proofs/artist/893aff61-56a0-4ed8-8674-9cd53f322d89.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 0xb959c19fed853d744048266a5569bed2f62054ac1f2f13ce73aba0a14baf9768. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR9W12401295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70601d3e41dd2f220214f58bcb42a78728554348f0d07b409a89dfe9d8c124cf. 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/FR9W12249953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d3d576a7cdf53f44ceb3673fa873d3e9e331f01854f80d612d61dd43c6b4635. 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/FR9W12321856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb959c19fed853d744048266a5569bed2f62054ac1f2f13ce73aba0a14baf9768. 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/FR9W12401295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f5c192573bfad324693b9cac6b0b0d17db0122133280a3151684d8d4740ea4. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTB52478927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x533ce64cfb8bce61b78ff2b0e3d14d1e49e2ec7b095928bbc561a2af6de52dd0. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZTAZ2416689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7f04ea5f9503b534fd4e058351cfca468977ecc3341896191121415c46a911. 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/QZMEN2473927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a22030bb755d92ab31be559fe092d2b4b2b8da294de43833b7cc781862d3f9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES72410593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699de97d94561b0ab4186e6ca155001aec0b70205ce4ce3bfd0f9eb184e63d2d. 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/QZWFG2382198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ae546e5d9a09157780c8176c147124bd1a5a6564741a1b879969681bc5de53. 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/FREFW2300200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dbb9e9fa2b38b2a42a497ff14af87da686bddd5518b395057451a4056a9552a. 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/QZMEN2383223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f65f30cd6f4add9f5415144f9dc96e92e5a3d6a2cd4aa2912298d8546d582a5. 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/QZFYX2347196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x057aec8db28849e218cfb01daed545409b176189f67b0bf1b7e2447ade346f94. 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/QZTB32297703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f242b5f7dec281a3c12afe52ba9e9f83df13b4f3f312f9b762449f1380b126. 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/QZTAY2252056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a474150e3890f165ecfd246cacc8e6edc9b51f7513a0ec067a57cf530d46eb. 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/QZNWQ2237160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd020f9678b3cc1a7e9dc9851b0a6dca818d616cf3949483271766a6611d4d5b2. 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/QZK6M2170939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc1f2f336441941d5f816524c69451490459fd33b31139c35ba1771aeb88f6b. 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/QZK6P2174886.