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 0xf32be345ae6ce5de1de4d06cdc28fbddac5a9d0e8d14d2ada195c5e0175afe3d. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62eb6054-8ade-452b-bb18-470b210d7e54.json and https://artists.proofprofile.net/proofs/artist/62eb6054-8ade-452b-bb18-470b210d7e54.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 0xb0a1d136c9ae65a4fc7094838f3ea1da02cb88ac5f49802140878af313a817fe. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCAFW2132923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef0fe05b67ad8061c171a4bbebe800b45495d1ded1c1a7ca44ea3bbd74e27b1. 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/TCAFW2133004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48f3e6d8cadb531ec9a227c7bc6cf89feac97deef6f0b08cff1da0a069e4b13. 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/TCAFB2079901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cde1a07a3cbcc1ab0534fde266866e55de985913419d57b060801d28c4ce884. 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/TCAFW2133163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2a1b7f59b7ce1508200c562a02c075dee925b490d7c27656122d3b37e37368. 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/TCAES2063427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65965a9e29e075b83dc05b743cf08df38f7436384c0d9efe28c279a672e3cb06. 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/TCAFP2155455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b43b747c9153f117c1b48073b73c4e9dda63354fc35a290bbf149dafef71f85. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFW2133232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeace908083b9be4c32f9e600e030bfb60a33cfab0113cd9175495d9693fc386d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAFW2133242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ace3b3832413bb0d7761bdf68bb25d3331f6068288ec786be991519b1d3023. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TCAFW2133244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65965a9e29e075b83dc05b743cf08df38f7436384c0d9efe28c279a672e3cb06. 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/TCAFP2155455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48f3e6d8cadb531ec9a227c7bc6cf89feac97deef6f0b08cff1da0a069e4b13. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TCAFB2079901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2a1b7f59b7ce1508200c562a02c075dee925b490d7c27656122d3b37e37368. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAES2063427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1bd0d2fa4c9f8181663359832251f069ce9cdb3566fffe1e2bd863d5733258. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAEE1978334.