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 0x717460927d7a385821ab1e4f885ff7ac11a7eadaf4f108ccdd55ab06cb6fbae9. 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/95779fdf-ef04-4460-8e83-3afcef972b8b.json and https://artists.proofprofile.net/proofs/artist/95779fdf-ef04-4460-8e83-3afcef972b8b.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 0x367169b17d590be6503302ef5a20e4c24cd975c62ba91038d83ebed5faf16cd4. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZNWY2255542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34490d38f5f90ea505ff96f83341302f2451182ef09fe201fe5ce27516d804eb. 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/QZNWY2255544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4aa6800efcb3af81c55267a9f40dcb94d1a526ce3c76047862d43b349494a41. 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/QZNWY2255545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da78232743eaf669a0cc40356a71ee24e812e4eda2b46c6488beb0cff8cc720. 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/QZNWY2255548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39e77d23e6a25e5e0937bf9ea76e46f14caddbea2b2835b5366d76562970235. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QT3F22418692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2cba22761f042a6e9fccc1bcf5ca6d8c9a388c830f8eefd2205ea531f5c7e2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZTBD2486881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f0bec8f927f3b8492d9343767676849702adf0f5b8c09e4cb3ad3435e84236. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZPLS2443167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0713c4113ca434842222d77e23c399dfe2695ae6899d64c4b0ab73e93c9e05. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QZMER2447425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb06708c618cf7acac99a970e993ee72e905fd6237c92cf81344575fb84007a1. 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/QZHN52449547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910757b0c8b588bc7412314564799e3614b7cfe6bb91a4eea2a44d70732b423d. 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/QZNWS2385016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278108a039f56a2beb6fba4602f32ab4229279bfe701fff24d6a4a2a38b0b531. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZNWS2388923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255d08ef7d4f88c30d08eac99df2674bf959d84e57e1057f36a23fa8a9ab8ba4. 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/QZHN72344006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b63d69a0548183d29b81a0fa894d92b7899105864ec61cbf0ae469df59430a7. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZFZ72371692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x139abe483868dc02139bf27a8660dee4cedc3643d1f13a4421c95ab3d093d6db. 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/QZTB22289151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48166459ca04c990006eabd6eefb7ad9f78c00cd798d4adf101b7b1a6fd0c064. 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/QZDA52343749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3973d4ba23037e510f7a0bb11d0f27009bbf87e45b4168284ac90b691e3a314a. 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/QZTBA2268016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae622910ed74eff850abc7de4e3150329a69700ef0155b997975e839ea74a005. 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/QZTB72298095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343169fd1cfd206e39da57c24379f2c238262500138023aa61b8e9231c7a080b. 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/SE6XX2225843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf75e9ec50e9e6d536f4b4b120844325ab99e920d0c36e2f25fcfea6869b938. 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/QZNWW2223891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28872ff04a12854cf88e27298d4daeeb4d713af0a5ce2c6dd4219c6cb1658a9c. 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/SE6QE2297279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01035ba793ea74da4332ff3a1f24251d9fad9c3c0aec60e9c47b64baa418b3f1. 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/GX5MX2252712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c85cf73ddaf1a4fb4db3b5033ffa1a3eed69c09222724bfc1e92268e266bdb. 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/QZK6K2200603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f6c920d4b92b09885ec69c3eaf6ee233c2793804af52dae680c47a0d7f84db. 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/QZES52251855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b11f4c5bedfb84645fda2af927c893aeac76bcbb60057370ddbd68047a8b5a. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZKDK2279904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fccc8291af5f0fe2f474438792f7752adb0f3679739178053cd2b622065317b. 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/QZFZ42239034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d9fb0e3db4c1095d1705fc72217e340575f0e1f2e7a51d4d947d9ba683948a. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZFZ32200963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c15947a9202bb475637e2b4e54c0f78cdae8ecc6cc71f9206e234b0daf5ba2. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/SE6A92360625.