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 0xdc3c071b0956f3285ed289febb6405944b7fd84aaa538e82afb5edb6d5b660bb. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1a6f8e11-08f9-4b96-bcf9-7049ac639217.json and https://artists.proofprofile.net/proofs/artist/1a6f8e11-08f9-4b96-bcf9-7049ac639217.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 0x12903bcdabc48a05dd0d96c7bc49156cb44f09f780daea962354cb60434fee2d. 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/QZ93L1903735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e7e38e13eee9fab661193b676b80f3ea0b0e2cfb7251c76e1b44c78d6c9614. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZMER2074994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce3cc98c208015167313dd3857dbf42a64ceda4dc816157821018d4cf3dce3f. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZMER2074999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76916648d948dcec3007f47d1281e8a1fa7dbea6a04b215a4c6613bd9dbe193d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZES72011476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c2e37a421bd095edbbb9e0ddf2fcd93dc41eb7d0d2f63e28fbbe07d9f8c830. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAGO2270830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5915433b8b8ce20928dc9e7ec67a6a45d408a21928c317425e426fd5171ccae6. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/USLD91726417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdd8b55e2d0ff0c00ab3266c617dafdfdde63fb914bda5040675e7f02657321. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USLD91726418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3904e51717101a23328a0d7446e2bac9abeb6861e92fed83fdf35cde09a0a1e. 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/USLD91726070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b7346f0e187a923e8d4dedee3fb8243277d4e5acca915d3d7907bc574dc339. 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/USLD91725686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f80afeff5d5df78c18e6ee84b177a3183d377c6762fd95834c6b12e8c36410. 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/USLD91726420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b647e68bd7ea50058acaeebeea72a6c0a80377107602678a9f3604d1c85cd4e. 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/USLD91726423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f7bcf491d218958ee9e8cb0c77a38bff787e18be3095218dab9f90d49e3c38. 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/USLD91726424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee1b212f6c613e4c697d05f774f1819b6f7ec61170e24e246dc315361e7f237. 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/USLD91726425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78f1a967d94d8c6c4bd99737883ca15dc6b703df650945b135c6a2312c38674. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USLD91726427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82b2ef6d3b6cfda0e6a8f7c0fde503d740e2fe6fc823bc5b1374e8d290435410. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZHN81944472.