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 0xbbd10ed18a0ed9d269f010553d4113050c61ed6a953e942ef2af42c54bbc6da2. 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/88c90743-f2c0-4c4d-84cf-e90b8be01027.json and https://artists.proofprofile.net/proofs/artist/88c90743-f2c0-4c4d-84cf-e90b8be01027.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 0x11fdc5d2706c5681e04c239645bb6efccd04dbbcb02cd2041791d340e552a7c9. 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/QZNWZ2202203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e39c7fdad99274930d2f49c9bc05d78f87799af5d1c45486a6218b45e1e405. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/QZTAZ2235473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5d873281cfb97b62f2d84781187abc66af4bc34a65a3cd1982f97428ceb82f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZTB42282793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17eb89140632cc334601ddcf496a2f4b5970a4405c59bce700ed5949d5554877. Chain 2 (Bitcoin): anchored in block 957526 (2026-07-11T06:03:28Z), 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/QZTB92210165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b617078258f1439622d12608791b163065512a29568e53e8572160b583961f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTBB2240551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99828bc8486233fcb3a8d61090ddf02e41ce8645164c40ebb96e792b002218c7. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/QZK6M2320157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e83a79d18a9d2efbdb7129272f31f72e3d3a91cca10da579350d67f8b26060. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6H2321143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5bb0a930e4c53d9e099c0f0479baa9232ecbe8b52b5e5ac74835d3b7305d570. 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/QZTBF2396763.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbc7e2a481df0992e2d1cf1f2f1624e77843c38b2cf029b1682addf294a8e03. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZDA72428691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95275a57eb7aa54f07be6306b69a185568beedb1804923092d36ba00dcb48caf. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:19:19Z), 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/QZK6J2467377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7d3e5f7a142aafbcd1fb771e0fbbdc61b43e5e04713121a632f943b95ab8aaf. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWZ2436108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dbb6e411a4a2f02e1bf01613a574fc812f5b7da0cec6b3a25083ce31df81067. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:24:30Z), 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/QZWFL2400682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58c78a4a2d1c7410c3591d72d593ddb5cf26d1ad7ced67b4499d0599c16785d. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZWFV2401479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025c90657a8b49feca486f187dfa2c27c153ded52c86b6f901cda28c76ca4009. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZZ7M2424986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b23a37b3089c618a5e61a174af9d0fc59cebc55405031dfe31ad0de5991ccfc. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:34:29Z), 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/QZZ7R2482027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58c78a4a2d1c7410c3591d72d593ddb5cf26d1ad7ced67b4499d0599c16785d. 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/QZWFV2401479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6bb0945916cb4a5dfd94d369f63f35dc7a41c330e06864fa05912d90de9d95. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZFZ42592945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d26e443839c5629b97ef86f1e74ce9bea3cdbcf3f3eb7349676fcffb283940. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T18:05:30Z), 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/QZK6M2542028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88dfcf270188dd0a77322b984d73f11f9d4e89b5667dcef57cf9308d7ae83d6e. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6M2542031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4e5ee040f8659bde6ce678486ed1e90a917f85c564ea6f16034928db9cbd4a. 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/QZRP42575615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5892567d0ee3637453ac7a67169231ff5fc2b6dc78e9c58c4cd21f3da2f92b9a. 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/QZZ7K2551720.