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 0x142c52bac5a97fbf9c8ea565241dee1ad592a5e39512cf4beac03f84e3f3b5a1. 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/766b7288-b79d-4c42-b60e-0bb7265cccf2.json and https://artists.proofprofile.net/proofs/artist/766b7288-b79d-4c42-b60e-0bb7265cccf2.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 0x670356eea19660242f471bbfead4fd14bb658aa2f458a431ba3e04765be35e66. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/TCADU1883120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6f16c4b7bd87dae4349e94ffbb3f29437f6ac2d4668907bd654e15e5bf237f. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCADY1873605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392605bd5df7c805c6e2b854e34044a7a313f485412aaec295f5ae3e84bea1fe. 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/TCAED1912512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf544656a29acfc7aacecc150351fb3da90248db04cd8aa6d4d4c68da604a7cdf. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAEJ1939855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e7406813759918ae4a24daf83ca5bfc3722448b2a6d036f4c5578f1b2da2d5. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAEM1999521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e7406813759918ae4a24daf83ca5bfc3722448b2a6d036f4c5578f1b2da2d5. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/TCAEM1999521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d03189f948d04c98a98597e6fbd067b433f661f0d30c0cc65bd700a1728fd9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QMRSZ2001917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ce0aeeffdf070a392224ea60536edf83350492f65aa4fa4b23493abc571997. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QMRSZ2001918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48334d1dcdb925288c8c2c412717f2cb99a3ca4c4bd3342ba1aba7d0e1217669. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QMRSZ2100312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde736a240f6ca0b80263e0e49dff41f622c4b6f4e0f535c3f3345c6af0e5bd0. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QMRSZ2100313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f52fa028b9951d22e0402e5a4e0248256d7685103544804b1699561890a2735. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QMRSZ2100314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318839fa9b88a4be065c811d3c09d051afbeb4062fd6480d08345149da1115b7. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QMRSZ2100309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5563d17f077375d64489418e3deb34495a23c08723a126606bfb8e408c614ca. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QMRSZ2100311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4865bb02ea0d788b4e72459127a7e6f650ee86adf854a2c532fb477f99e3bce. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QMRSZ2100310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bea8891be50b207a54e0c526f2c877230c4072f778f3be13e3198b118326f11. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZQAY2458053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fba191552983908f3a53f3724d930e1951b4cfb8a86373859bc2b068aaa57d8. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZS7J2341158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c635138d21066241d0109885b0894f214a166e729a3c1b94b3c7b235f0d53b. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZQAY2345784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9348b1bfb3e3249fbe089c68d07208752dcd9f1e9eece9cabd765c1b6cd061. 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/QM24S2205731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95255593a5fce6917b8eafdb39375edd846b1d7669535ebe3eb6f44feda9ae4b. 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/USLS51824605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fcb89b5436fd0c1cae72b26924861a4c0efbd60d3de9192afdbd1326c3b770a. 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/USLS51824615.