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 0x93c7ca47056bc01c779ec012e5a5acfbd4113382db9e857633e5297fee315e4f. 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/cbe4f1ce-f43f-4a2a-91b8-996d746c793d.json and https://artists.proofprofile.net/proofs/artist/cbe4f1ce-f43f-4a2a-91b8-996d746c793d.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 0x6d8f9319f9da76495f5030f9e15bc1e069f4d0da112f52c0b2b0c1227a5cf87a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QT2VB2448205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0793ef2e6cc5a12b37bc7b7ddf84020b6028ec5417023615f53c7d0903acb407. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QT2VB2448212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c525c652c0d904bfbdc078c0858c0f44bf88a9db8649dca0d1b83d711a4209. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QT2VB2448210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabc523d40afe0471d5ae6a710b5418cb8287f3423379cb5b5524c4ebdea8ea03. 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/QT2VB2448204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f3f95b20b816f592369d79ea8878f45bd97a0a5e0545964309a9b1fbd53db2. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QT2VB2448203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975d49da3db50e7113c8e1840a56e3f3d1728d10625da6525dc739664652526d. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QT2VB2448201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf090243a2a3a9eefa9687a78311c96f24ff6dd07dcbfbb24e6d24ee9c4dc84. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT2VB2448207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9521bd36847e302ebc384c3a466169df893532d604f410bd50c45e6f892240. 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/QT2VB2448199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755803ba4ad912688d5c993b59dae877f1af1b3c4f6d2c6142233baa2920d68f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QT2VB2448200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34297a7f8c9a2059c33f3ba6adfa81ae9aa32559824c4ff6f3d7b63449c4b7a9. 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/QT2VB2448197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b4c4775f9028c4876902012ec946cb650aedab2ff064bf6def58caa91443cc. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QT2VB2448206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de5aa2e38fba5485e8d8cfdf0f858e05194f8f433767638204c8ead7f6f4afa. 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/GBMJG2424923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d71579ffeed74a9c6cb24b0eba22fa9f44d8f67f35d62add6085a4433f456e. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QT2VB2455481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd90744812488c7c05c666d811495a0d1275e30df72cf5c39c6011d7db0ecdf7. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/QZVEM1870516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde8e8aae4a5af06fd1b6493733c4a31b8179a97d7295373d571d91d7f79cb6c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZPEW2512695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8998d91e39170e68ff0b7c0f217a8f63835b5810fb4b9e246eed4759696996c. 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/QZPEW2553581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6538cfaf1988b800314a75858dd5b9793537aca03505cb7c14fdece8408a0741. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZVEM2565193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d73e900b39612b75306204ba824d56430836f21224191077f8dd95ad855743e. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QT4K32592626.