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 0x6282d3be88c7b28ea7daba9ca88baf3225ce622ad0612b198e2c857d429efe84. 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/b43d9ec7-c026-4a9a-8ea7-a2ad26cb5d5e.json and https://artists.proofprofile.net/proofs/artist/b43d9ec7-c026-4a9a-8ea7-a2ad26cb5d5e.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 0x31cdf702749c43bc1ee3848db11e29e403ff8d96fb9e1c40ea8301ec953c06e0. 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/QZES92395333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77c58909c2543f09a33053ccd69c63d133a2918194ffd5bcf38e27cd313de9f. 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/QZMEP2334800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47484ba6ed5c9106032ddb9fa3fdc267e9973e4a4a3189fa4057d57990c7f614. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZK6M2302618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77c58909c2543f09a33053ccd69c63d133a2918194ffd5bcf38e27cd313de9f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZMEP2334800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x472aa91323ed60ef64907111fe56fc55bab8457d3a161d40645e6207c42a8b69. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES52300424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f068db832d1325d170d2ec2c1d666b930b6635e1c7b1e6270c9d059ebbabef. 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/QZFZ62313963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31cdf702749c43bc1ee3848db11e29e403ff8d96fb9e1c40ea8301ec953c06e0. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZES92395333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ebbb8973979179d4bf3814de28a42999c5a43546a7d15f66990569bc708db2. 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/QZTB82290677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a00bb56dd1c5ad26264da12c295fd9fd6dc58f4ae02221fee19d130311c31a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFF2376640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7890cce5b4970eb264aff9d646eefaf7bd8ec00785dc8dd2ec0731d741350e6a. 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/QZK6F2468230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d8966345dff3ce97206278532cf8cff1aae4488fc07718017bebb1969f995d. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZTAZ2476843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417d370ee68772b51b0a199d746afd2ac1f12822f374d3c60af5fcaf030f9994. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T14:06:39Z), 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/QZTBC2445376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d8966345dff3ce97206278532cf8cff1aae4488fc07718017bebb1969f995d. 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/QZTAZ2476843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadddc23471d494df16c924f63ae3203dd5c136429c71b15a0515ed276dd2d100. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFR2430915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7890cce5b4970eb264aff9d646eefaf7bd8ec00785dc8dd2ec0731d741350e6a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZK6F2468230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f6dbba8691cd48851e7efa00f5ab0ade6c0a6fd74c514fbda657291127f405. 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/QZZ7T2454187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417d370ee68772b51b0a199d746afd2ac1f12822f374d3c60af5fcaf030f9994. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZTBC2445376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb06b08cf52ff257cc1a39969210f7adf4d97442548e53f331fb0702c71e71578. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:43:24Z), 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/QZZ7T2454188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277d8f92412fa2e111c487cfce4e04e810c57fd0065f90ce2a96199d5142c7d0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAW2445599.