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 0x2129432bed01ce7edbe116b0e5b5cb015c6fa164aca6af5b3298a7c0d429eba0. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0d5d716-f856-4705-b058-19def12cd686.json and https://artists.proofprofile.net/proofs/artist/c0d5d716-f856-4705-b058-19def12cd686.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 0x25625fda95cbf112149dce194617d9f33caa0e854121c75f50b9a05a4d723438. 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/QZHN42436405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0104ac009d1856182938bf1607d59493a090e700ce2b85808746b63bb5312b4d. Chain 2 (Bitcoin): anchored in block 957756 (2026-07-12T21:36:27Z), 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/QZHN42438455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1dd5e7ad48f0cdcd5f9dad056079720b485c4c4023d0a2362d0ccd768eafbb. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZHN42438440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcced6b477bf4a082d613f5c9641d0b9352495491c7725d0e337c8776fbf5fdd0. 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/QZHN42438462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eee49bbe34a7379159053eb3fe93f545dc7ca66a902fc092bd6a4b440b62923. 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/QZHN42438441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfef7d663bbbf3c1d1fee2b911023e7457a6e301d50bce7db4b5468dbf18e7dad. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZHN72492031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7c9f7547285433de635a3d59a6a877fb60f7b545c3ae2d0a55e98828409f3d. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZHN72476183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7f47047f846eee8a940afb31f183b9a066881b6011aaa3ad445ca47c882ce0. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZHN82405458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd14498dd4751e9dd65909e53cebfa2659955c5525b1e9ddbb0cfc8c6a28fc3. 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/QZHN82405570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbbfb99df2cc4e038674c07fb2f735dda3ec401d55d699b15443977fae284aa. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZHN82405457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeee90d4955440e75b0ba362d369cb36b583720baeaecea4b503f82f0ffcbd73d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN82405463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c80a276ae07aac279b93676bd8820cf18583e9d295d6e7d88d53e4c6acb584. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZHN82405456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ef13578bf1d2d7b719a75c2cab256c36583a0e5a46dfc48527303d61391f66d. 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/QZHN82477810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d1351dd53d83fde380cb160c6a73ebbe34ce5bb318918f3ad92c015b09a3cde. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZHN82477811.