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 0x87bd5630323f18ca369fa001e6fa392a74b587c8f757c2fdab2319ff4251a0b4. 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/d6f63e1a-c7de-4f07-b1c1-3713112829d0.json and https://artists.proofprofile.net/proofs/artist/d6f63e1a-c7de-4f07-b1c1-3713112829d0.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 0x94312502bc29c9e1ec3f8d396c0558f36ffc853a1875b7769a5e1aa0c0e0b302. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZMEN2440670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4f735de2c04b2fb5695eba17bfd7ffd138e36c1fec409ebd63980d5b90a960. 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/QZMEP2413464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb7461997144ff4fbb470476dd60ca3e75a7bd8f8cc60894e324a9b15e1dfc84. 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/QZMEP2479836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4bb5440c63723fd2740eace394a5903a857d0ae25ace682f27080dbfd347265. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMEQ2416372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a6e838f9859c0bdb32b86cf1dc7bf3749371d1da5c8e909f5352eff4ba80309. 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/QZMEQ2463029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde07e16eb4b674dad9e682f720cdc26110d142a85c5a0f9b399b2b0f95626213. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNWQ2446992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d8d4dac5432b39efb3d3a1c783d3ab7eb2759a4c9938857ecda11c1743989c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZNWS2422093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7a2d4478f560da28c36c72068a6ce9731648f67227c793d10ac208108b1b7f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZNWS2403147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a51c0a35974f1388e758531d89c1fceb63f14fd4fbe94aab7decfcad792fa46. 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/QZNWR2415670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433ecde71b3c93940e088619bc8547315edc49e898cfbe5766d733bf853a280e. 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/QZNJY2490573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd60cc3f900930f1cff2ae19d85201c4c6f48251bb155c789f5241403c0ac8e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMER2433428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9841ff3ba1799719463d932e0633bb0462b1f7d02ef99bff8d99796f9146c4c3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMER2435175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d96c29dd6ffc56341b80438f46d3ddf497a4785bfb07847e9e72d8bb950a0bf. 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/QZNWR2499618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bec27be87146b7364e6c09e35d6caabab08ee195d582724f9be534933aa7feb. 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/QZMER2447925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe520542d6d89b43b32c0bca60531ce0ca5a6488333c800a9591c920bc9482e98. 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/QZMEP2461111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee00cb51552ecfc9ce955d9116d2e012440ba84b872bed334d3143ea39086cc7. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZMEP2469148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999b82496fc06d71a7f5e730925e15b0ab5f115fa288c3d718706c46d4dc97f1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZMEQ2471515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6afc4c8fbea9acff4ccdb52dfa9cb455d909ee4eee2d58d650f6e9b8a3f34aea. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWQ2433757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca752d4db7848cc54e515ec230ad919c6138bfd2a8d03a74b3c4311b0444736a. 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/QZNWR2496335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c3555d31f708ebba584114e12dbf87744ac9044c57c114daf677066f2dfad0. 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/QZNWQ2487912.