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 0x68206bc912974e8dcc496341ed83cb5e818d54c60cdd7d4db81790d5ce2b3802. 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/1412d8f5-ab82-441a-959e-4be4020b7d52.json and https://artists.proofprofile.net/proofs/artist/1412d8f5-ab82-441a-959e-4be4020b7d52.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 0x82bde70467333ee264e7f679d58ae39c61ec7a9258ada85ac58780f6f948bbe5. 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/USKH40503052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9edc38115c9e4e5041a87b3023bd4e39a94c755394ae941db6a63e85d336c5f3. 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/QM6DC1714817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b79fd93b3b8f0de9bcedc085595b415a27271b443c0e46def3275f8c111009. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QM6DC1714820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9d306053202b098c2a1e50c94446bc836531343a0a21f3b272a1b643249f4a7. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QM6DC1714828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f69dce2799e60aa969e62994866faf014175743fd8c52c354ddae6ab360948c. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QM6DC1714832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf6837cf145110e1fbfedade98fe1962cc34d3a09fb96c05da83be5f970f65f. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QM6DC1719221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cab5e236f0d6d2836055add156d48d465ff4bd0b427fb95596f18ff940feff. 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/QM6DC1719230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e842b49c3beae615b7eb602f759e712cc85f00544cfd2c0e82507f585156b62. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/QM6DC1719236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bf6837cf145110e1fbfedade98fe1962cc34d3a09fb96c05da83be5f970f65f. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QM6DC1719221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cab5e236f0d6d2836055add156d48d465ff4bd0b427fb95596f18ff940feff. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QM6DC1719230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da67f89bdb4b29dbabe0bc02ad1ea132aa291022b0524df13453c38c1c589b5. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QM6DC1719232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9575aa9785615c6daf329ca38b9a1ff67a97ab232cd5a997fa986496d6433f2b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZDQH2399200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd390fa3a55a8207fb5030d88054b6ef4783bdd8f5f614e281f5256ec302eaf49. 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/QZDQH2399206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fd8edc5b1171c510ae8cd62e1d30aab3b4ddb513238bebe521ba7da88dcd16a. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZDQH2441405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58f3fb01c7657ad19c3ae317752904e9b004daf4a542b9ef51b4d159a6bf004. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZDQH2533637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4648ea5b1ccfc2ae3722948de27a6630e2ee8f9205dd236c8fb96094e243eff. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZDQH2535367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9621b99ab3593afd8042d167789262505486e8c5bc2b99a08e8ecab2481dcd6d. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZDQH2536680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9d2e77832e1bf10891057580cd48ec0957b4977f15bf5a4ef003dff40ec5a6. 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/QZDQH2537860.