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 0x85dd2f5a1673f516e56c037fd3fe13a84f1620c4e07d99fa6d764fd22fd4e974. 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/95a89d90-7d0d-4c77-8d83-409c7b0061a8.json and https://artists.proofprofile.net/proofs/artist/95a89d90-7d0d-4c77-8d83-409c7b0061a8.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 0x02d06140ae48be221a5fbbfbdfe687c7eda7c5a3fc5059960bd5dac23897fda1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USL4Q1852622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dcc7f2f61c30f2baea0776953eef4e5dbe16d45e86aec72fda4a35f4dc598d. 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/USL4Q1852623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa188b4c329bc8eb8895f26ec59b3f63c4713817a602b753bbb1ea8390b539171. 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/USL4Q1852625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52342430c704d12ea4257884a58f54bb0aa1d2815c584d02e9737c79ffa8dc31. 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/USL4Q1852631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23d6b4a649f03bf0977b3e60a4166c4dfea7c20340f9fb3c4fd7ab6052c5183. 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/USL4Q1836248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c8263452ad3b96f3bd1f8bdd80b86f7b872851b5d888e9e3929f7f1c1c3a5e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USL4Q1836249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb986e2d11c5a6d594f98637e38e8f421c0e6edd1bbe16259f79fa339b456f51. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4Q1836250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac966eb723c7b83b4d55bd0ad71dac6d28f4245b489aae47857959d625d7b16e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4Q1836251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ad6fff4991e44a995d5e8dbadbbb81a536ab666c2f158041942b21642ca0b3. 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/USL4Q1836252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf88e9efc031bf2ed34b4e0117407b56caf912aa3aa62ad9585ee6627d4029fe. 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/USL4Q1836253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44a34231ffb0c69265ce35de7b8f7fba9d53a1e8c320618f1b582e5b6e3700a. 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/USL4Q1836254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5f7a458d69cce70ac53aaaba5f90337ad57706b27bf522deed5cbc157e37325. 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/USL4Q1836255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3947ead1a5865e0e3897c7632b6bf4df89c3415c3943d19005bab60fd7d96a0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USL4Q1836256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568e9646d788f554899cf0330d8cb0ea394fa0b3f21e340758ea521560e18e0e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4Q1836257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80c3dcb0b4f80d284e44c97a2d857fbd1f0f4c2e723a933f8b2eb2b46ff3115. 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/USL4Q1836258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75ad5a4397ccf3aa4db6b615e670d5912448fa1fbb0759eae32314acbc689bc. 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/USHM21724411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cbd69446eabb364a30aabde6049dab32f501c9bb86fdc248654892cfe3a26de. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM21724413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24ec91c7a6da3ee286fa16722005b6ae499e3d827c5ec5da4a34e46ead816b42. 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/USHM21724414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896f6e33d89d83aee7170ba0f980d7789b0c1c8eedf5d409ccd791f7266b30ac. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM21724415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f87107d91f32514644d1510dcffc9e8f1b4baae28c430da57cb9bb45d225d89. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USHM21724416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd32540d330c38a43a6b1d7f851bc596a92fc73188a161aa85af0fe17dc2f97e5. 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/USHM21724417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9890db39aaa6f0884b9cca978c4b56f33703a8c18cf40331b090af26ba36ddf8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4Q2306711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70e6fa9e66a9c95c05fdb237c8da971df5e13b603a5739883099b77c0698b6d9. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:03:10Z), 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/USL4R1804213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe72049b2d7b58c13b286b1c074f94bc2fce09f263a05c842bd53c456cdbe3230. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USHM92018655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67fdb79f3872101ab377c3ac60ba843be0d12c1d5d3d52e25179da10ff384a5d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USL4Q1852627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfadd7557664b6d9d45e6d448ac55682d963d5a2de70cbe03b0d36300ae28ddf6. 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/QZWDD2443520.