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 0x59eb7c6f4c5bd1036001b2706602c964fc2d9091d0b1bdc235b9634e27cda6a7. 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/c0039941-9ca0-49b5-976a-be736c1021bf.json and https://artists.proofprofile.net/proofs/artist/c0039941-9ca0-49b5-976a-be736c1021bf.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 0xcaafa2e611795023519d1179795fa1a448debcac44d1644f7378b005cc822feb. 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/QZACR2100354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc9cb501d79661cc014f3ff4699ca223f5fde15924eb67ab188d58cf53e34d8. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZACR2100355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267350293f358f9cc104afb9177a7aa6efc79fb29d69fbefaa2cdf5ab1dfa02a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZACR2100356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd661bf7ac8b2e7bfa49bc719d23b759724d5a8e7ccda05cd05ca14b12d4cefbe. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZACR2100357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7960c1a71706f8ac841223337e2814428bcc8e890e1bd5f57f6b0719a5b838c7. 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/QZACR2100358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64843037817e5ea8aa1080c3fd4b0b65cd777cc408512549ced0c9f3b18bf3a1. 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/QZACR2100359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5621eb21af46a21015522997f060855659c2757eed263e46815e2b50270acf3f. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZACR2100360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9e167daabcec37b9984f800b96568223722cc9bb9bbbe1e4ea6f335196cab8. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZACR2100361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bdfce940dc603020d1765a95276d4b2827604f557a675e6822a01facc3396d. 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/QZACR2100362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226f6c5008b40abfe2703b571d8bc9924413d754c9b0188fe3fb21e62d1c2587. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZACR2100363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d02edf454d677e4834a6e3de7e6166e077d914d41311f2c3597df2d42eaff2c. 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/QZACR2100364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c48c2d4977fb15998a11c285ebafc8bd45ce8b0c80103dfb0a1627b64755e6. 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/QZACR2100365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4888d32e358c82173ec56e991889fb8d58b58d9a89df1c5175f1f50c1e40b8c. 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/QZACR2100366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa55b62862888b104c3e3607a6e39361232cb2e63e1cc10968b79493cc8f8c1bd. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZ4G32500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44573cc06d6f36bcebdd19cb9390aa8a82298eef566a4da7b37943d647a30a3b. 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/QZ4G32500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69821622972d7c7bbb5c5479ac2090138a649705d271bd49a075107c7a888310. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ4G32500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba208355c939e102bb03877de79837f353da9c5a0410de5c9c0faa22fdce49bc. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZ4G32500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42098e4715566afe96c716d8afcb1a91c2276be0f60d6708560b80648c5b7a4c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZ4G32500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bfde90650025a4fac3dc0f06723b708c7e96e8aab68aa59cf716b65ebb0146. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZ4G32500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a4873040fca0adc43c6f321a5b82c0589c616feae2ca35d9d8e34c755c93f0. 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/QZ4G32500019.