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 0x4816532b4a4e0b8a85d4db54991b392c978f8f08a08fcd8073a79a6cf108aa39. 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/8384279e-c623-494a-8392-9bc3dd294a18.json and https://artists.proofprofile.net/proofs/artist/8384279e-c623-494a-8392-9bc3dd294a18.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 0xdbb370d833987d0a3f1a110da6d4633404fdd62b67839a3d7e879974c6959209. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/QZFZ41931270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e78c21feb45ba2e0709cc281e34d8994214e5d0bc4382fd18402923326f343. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6Q1997907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fb34d63a579f76c40e72489a33775d4fae37548f00b588de886657bb5b8650. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZK6Q1997908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef428697906695ecaa3baa9eee0170be3917017fa0a5b6fa7cc3bb17f5d78ba. 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/QZK6Q1997911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eca1b9e40ad53b5e1dd5000dd97e7f82bc6cab27b2e038ac880d9dfabf7ab07. 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/QZK6Q1997912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d436b3a3f2049913ed89f8c6cae73c1e8f077c9a4ca8c87cfdbf66c443ccef. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/QZK6Q1997913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb502e7a1050198b7b722e3bdca56128755fdb378677a63c2d3f513b690415c8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZK6Q1997914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf1739173536de375c3b23499b106c0c2281ecde8cd67b95366224a0a5111cd. 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/QZES52071087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c17f8ca6977fdcd18a4db11d7cf2c7f579c1e6b639bd4b80acf48aace03b598. 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/QZES72149671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47305d2d8443aceb14382645d57ffafd0a8553d60bd5a695e75ba34f6030a20. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZES72151216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64878832dfc2d9b5ec7c7a8329df17cfc7be6b354d4cdd0a9e49c8e10214db88. 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/QZES72151217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63af5189b1771dae178ce5165ceec44e31b65b60569979438c906b55f25e53eb. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QZES72151218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3502730493186cbaf129032fbb0d3190e8c8ddc355f005554b7886fe0deb8d2. 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/QZES72151219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5779949254999f3ca38df63f493b1f920d54f20ca5c091925f1c897bd0d2ed01. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZNWX2207955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5319b22aff20d9a88e04afa231b4f6ae626408a89df11b405e95043972384f8. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZNWW2138921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f3b9560990ae57c30320e2bf8335903ccff3149a7b0b83f1039965e548c554d. 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/QZNWW2138922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3c8f952ac5fba2e795e7dfdaaf902bc20455a86f85a97fb2400fbac321c13c. 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/QZNWW2138923.