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 0x7a6e283b3dd9bb75bcbae97996dd9122e694590c66683925d76f83318f7ffe97. 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/a6fd2584-b40b-4a15-85b1-d8cd209554a6.json and https://artists.proofprofile.net/proofs/artist/a6fd2584-b40b-4a15-85b1-d8cd209554a6.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 0x4091995a0a98b145382340a243b5a04b4f7f22d31839c71e5bc5875862e39ae1. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZNWX2482613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9c6f20cc04503d46cb3bc8ce694798603aa388b2c005f0df569bfc360a3bdb. 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/QZTAS2495926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea943820edd3295ee52d34ba736982a185380832fe377453b7d9d0968990b2c7. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/GX53U2406360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c9bfbeda059787e6dd5388f94debadf399b53aedfbf3b6322b96aaa5c528e8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GXF9Q2522376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4091995a0a98b145382340a243b5a04b4f7f22d31839c71e5bc5875862e39ae1. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QZNWX2482613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7532c9b88d5fddc97c5a7ca7d9bba811848327e197870debbb66b5ea817504ed. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZDA42535516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8bc4d727e89ff6be1e358b45980a989f2d7f1c0323e10b3192ccd042604e39c. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZDA42535517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d73e66731afb4aedf7dc35f433db5e55cae96caa3c5509b172f4e07bd4ec611. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZDA42535518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7124f57a1c90f7457b49fcf2e46d337665e66b04b171f714b476e80ba04fac. 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/QZDA42535519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae700a4c4bcb3d2d15594e957148f305cd9e540bd0553c543bde138945522ab. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZDA42535520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd914df2e9787dbc87051ff1b45e609d22661b595a1551e341fa1a33035df1064. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QZDA42535521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc018693c86ff3754f51970a29aea45d1264bd599ab13213ebe955dc75399e689. 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/QZDA42535522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ceb9a6f1fc535d93b40293b5473ab0bafb1ff2a6d3e263fd160de872a1827ca. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/GX3Q92556210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c3b0e27581a5f7ad83e700db490f263ffacd7cfc1194e9246f63b72ae5ee53. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBLFP2555115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c10a50a51edba9613e94a9e141b66b7f166d7aa3485d83667a395a153b84072. 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/GBLFP2507530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9021a241fe1820827c07f0b431d56fd85ddc7c7a9e909cc3d6691587a224d8. 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/QZN882520499.