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 0x9e5d967055d24f2bee707bd60bf3792e3056e5adac14c9e7aa39fafbab8ddc78. 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/d6527982-00b9-46fe-8600-7dad76f1283a.json and https://artists.proofprofile.net/proofs/artist/d6527982-00b9-46fe-8600-7dad76f1283a.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 0x0cdab80471b80491ff948569a956bf2cacb6c55e003d5627a7620914cf1b03e2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZDA52417644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0fae65ae3d9de669f52bb6fff20be54ace898f495f561fc47d1dd7cb1a7591. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZMEQ2250039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b7f9b672d3e56300eef3b32c5986ac5ce1a0e6b0986a69f457c0849ef39681. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6N2419489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1e38ef9bb1ac74f5a2ee8c3940c8b5c0727cb39fd408758686e5929ee6fe6a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAW2293020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4c713a97a5bf9064faccbf1d75ea4b7ad93fbeee473a3dd71e9c97b37f192d. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZTB52248417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812471c5a359da2ccd720e72af7612cd5ce3a7118e08e9da65d0287c077dfae8. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/QZTBA2280033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812471c5a359da2ccd720e72af7612cd5ce3a7118e08e9da65d0287c077dfae8. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZTBA2280033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e8bd7e73c02e5b03db05a9d901c41432a6bd0b9dd37fedc57cfea11e43b867. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/QZHN42308942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89acfd0911dd6b5e3251d48326948608fa153fd9d7a157bae1e84a9f60748f8. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHNC2482076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6629cbc413b967396c3946b06286106fd617564ad90ee2ffcfbe443f910954e4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6Q2403133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c44921045c0fcab93a02b0abdd620f6af8778a1c099dafed56945b69b05f8e0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6Q2420577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3217c92983d5914dc95351f8b945708b2062caa3520ccfac2b1b23e230211dae. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6N2419485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ff9b5c2bd9d7f3c0738c908d84b5b1d72b228fb94662dee94c092f61e71e19. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZK6N2418598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1892cb3bbdc0eafe9a61f15a4b56dff23cf6282eeb4630b888f24081c5a7bb. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZK6N2419488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x721f9cf261871cc235b1bddd7e20a7b4dc03d52834aa362f219c57a485645fff. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/NZPB12403489.