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 0x7e10e313f8aeffabdf013825121a8ad95a7fe9c9157cca7c0cccdc6c8e3bb1e7. 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/69aa9668-dfce-41b1-ab8e-e034974f263d.json and https://artists.proofprofile.net/proofs/artist/69aa9668-dfce-41b1-ab8e-e034974f263d.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 0x39b297f1e572087fbdf959dfbec79f96debb7fb73e450caed5c565a5a4c63d09. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/SEVVF2103502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x651fed3e4353851cf231a8662daf0f0998020a61ef7a7ea11fc943df29108ae7. 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/SEVVF2103504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7ccdf0407069eab4f34a6fcbfb1a2d00a171bdf024fc1ea1061e6b3237369a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/SEVVF2103505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddca63a3e2fd568986189ee8426b1efe3927f5c1361a6a7c5ca1a32f6778042b. 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/SEVVF2103506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696c6b03a3a9389386847b6ec4ee33d948a7fdcf573df0dcba8fe0ad16fe0f20. 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/SEVVF2103507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896520e9fac8fac2a1633afa949a77fa5283f3c34f74248a5d5e3adad2841987. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/SEVVF2103508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde4279c927c282f30dca1456b62045f37796c9554aee9790c33d23c639afc5c3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SEVVF2103509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fec76060fdc2040aff4209581cbcd5dd594b0e5c16df0f73b5273fa9e268141. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:39:23Z), 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/SEVVF2400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1315487cb283b1bf5d2c8ee3318bc2f512a837270c559fca9772f3ae76f95b2e. 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/SEVVF2400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4464cfc4176eeabdc98d9c49adea2bd9c8f5d4a18d61f21ed9f5d995e17f607. 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/SEVVF2400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea42ccc88e209a33ee8528fe6a32dafbd6f79d627ce807da8b1ac65c7f5fe1cb. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/SEVVF2400304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31263526e5679ea54e1a2fd1054d5b9901fbac8deb1e7264230ac4383fad7e19. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/SEVVF2400305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5761ace62f72f2ae54352d0fd52d3c05d12ff3c274840eef29922c476a5ed401. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/SEVVF2400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cdd0dee625085473e14fd3f2167e0987c27db96d059c0477fb9f2786523efe. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/SEVVF2400308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16077f1d8eb2249634525f873176df66d81a2a47623be295eeaf7e103d4326bf. 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/SEVVF2400309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a988f20fbc458114b7fa1e733012958e512ab0a80c67152aa173e6b1eb4bf6. 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/SEVVF2400310.