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 0x029bf2ba8b4a56efb3c89c8c355cf86160304d8e6c99cd5505d3fd57c6aac97c. Chain 2 (Bitcoin): anchored in block 953709 (2026-06-14T23:31:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d161554-1679-4a2d-8918-a963f8978470.json and https://artists.proofprofile.net/proofs/artist/7d161554-1679-4a2d-8918-a963f8978470.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 0xea1f749bcdfb94cec61bb6e1f12747cc4328eabc41be6e5e704c54553beb7fe5. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/UKXN22552218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7492205f04019f462f198512075c19b252eab04af800424f8927aec55fb1b161. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/UKXN22573269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f986da38ea4a8263f745d6f7ae2ae8b55879d7992b1256a27b200ada30ab95d. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/UKXN22591202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b6f7b931de5c08e08ff53a69a8f1e16e6925d32d114a3aa05506b539932459. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBMA22564046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1534f4a591e46cd88156eeedd6f23836caf6650326765c2039ef004cd41971. 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/GBMA22590381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6273d2a7d6b504c58ad95d5c2a46a0792665a51c33267fa1272bec311a4da6d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GX53U2573391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7474791d20a75eb94053885b3f30fe5b7a350f34482a4b695fa982de2bd1ef. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/GXHAF2567729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3620ead11031c4cbd0a4147d8facfe1d12c981569764ef5b6c2c0fcecc5680e. 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/GXHAF2597871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f80b88cfa3ed4e42382a911bb7e6caa9fd0072d0857afd11006e5f32349db. 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/GXHND2500979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dbb9902fd9f26a4177ac3ff6bd8c4f3f46ca705303bb3009a619fa64fc0b90. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/GXHND2534029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88ae8fd99ea106b6d964aedc9b9eb7da9e9b56a5217b91b1ce9380280acf5cf. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GXHND2534030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9125d31795ee02010754eb743830dd3ab9be273ebe05b51f66ae98550d2bd6bf. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/GXHND2575668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b4d142d801226b86d90bbaba40cde7f4517dc02e4485d6cec25dc947a37489f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/GX53U2648068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe098cf9a177ff72492b6b1a64cdda4b4890c8fd096f0d01eb1404f81c4ce154e. Chain 2 (Bitcoin): anchored in block 958882 (2026-07-20T12:45:27Z), 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/GXHUT2509356.