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 0x1d6400bdbb000c1ee292f1944b43f356dbd8673600abd306369b27d91356f08f. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6201d1db-2db7-49dd-8d13-2abc8331a1e9.json and https://artists.proofprofile.net/proofs/artist/6201d1db-2db7-49dd-8d13-2abc8331a1e9.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 0x439804ece05099365c1bf8b225f60ea022dc225e530ca8e8e10405e1c1c06a7f. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZHN41987131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd480738fb917422cf21a6ccdf006a456f2240451a2ddfeba5498e0e2f52511b. 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/QZHN41925873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf5762f112831d58ca404be66ffc9695190ab11526cd20169543a68fed59938. 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/QZHN41925876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973d3ebe5f7a2ff14344e10ffd71629bbfe6f33c9252fce13f4b3f1dd7ba3823. 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/QZHN41925877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4b087c64287161da93ee14cf055d92a0384e4c6c0738e6e94d6eb3a39ce3d8. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZHN41925878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb776bba62977409f8e20238f028244bf703756f5647bda784c71f3f218282a91. 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/QZHN41925880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae2f0f171fb9ade1145036ce1407e40d273507a423dc1da557fabca094e0537. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZHN31915508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe239a856768615808c68bda98f8cb5ca0cf7a5d7b6cb554b002b981e3c3b6a09. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/QZHN41957465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x468f068d8f202af842e999f70188caf949b45208b073b8a3ff6986adaeda1e97. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZHN41957474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63f1718df9da8485d90fabea955d94f38413e9ab79ea6f4a000ad88850ab1a6f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZFZ71981076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac1eee82d4b2bcd7a48120f091ea883ce81e85de2999ae01febcae6fbb1dcbe. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZFZ71981079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4c1db039133277c8ba280b43e75b323f26896cbc512605e2c48fbd02789207. 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/QZHN41976037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x216b2f07ba5b0ec5ae6b674bb53d217f006d1b67d1cc9c940de7908d9c7b51e7. 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/QZHN41976038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbea9aba697e79c2cc5dc699fcd190e536faa60e8baf0bd022ffb6fbb03fd5d8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZHN41976044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x070546e32719e388bb74253086c7bc9865aaa9cf87472825983c6da668cf1ef8. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZHN41976050.