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 0x82150adaa73497be10c829cd6f5b1c476482b24d0bc31215e9c9a9f0f6c116e5. 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/bbc127d1-7403-4d50-a5fa-f4e7139a0692.json and https://artists.proofprofile.net/proofs/artist/bbc127d1-7403-4d50-a5fa-f4e7139a0692.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 0xbdf8dddebb6ac62d1d7f60be8331a38183d906cddda13e4b2297bee2d853b0eb. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/UKKBA2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95008ea91d21aeafeff0fac5cf46f620c077c94c01985b562efc059fdab3af0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL4WT2400346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479df7ea75e5e1a0118f4b9e94880238b9e29ec2515a01670c71388909025232. 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/NL4WT2400310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59231c0f41ff1862fbd5a2bdc681a3e437598fb5715b1e475e7f878659535908. 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/NLAM42400328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4c1eb6d7c5b761aca3d2a4d7e9b40643517c5ad11b47c9a90faf93147910f0. 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/UKKBA2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19e94b9b79b74a378924198e8848c35eefdd3c3540d481d08e264dd7c7eedbf. 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/QM6N22454882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ce30ef2b5ed499178321e02a7e91a52262b5cad6b3f52e589a4d67ae40a9ca. 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/NL4WT2400093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081ae847c6e76c8ff81580366448e3dd5a415a2a269b9767d116e2e8b1ca9e72. 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/NL4WT2400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43040393b09523f2034e0f5cc128b637644158bcf39949508426742b9ced93bc. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QMFMF2331485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fcc0f3315510fe4cb4fe2672502842c7316c0bef44f4c4b6631a25dd448df39. 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/QMFME2374467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465cefb14ebb81d72d290d704c0726acee66d646ea830f2b37b6ae75aa18e788. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMBZ92317966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7809a9f35a14d701d6a14b68da9251c566e0596a09b825eba1833109dc00bbd. 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/QMBZ92317967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cef101c09e3a6491dfe3deb2056497f9595a56066c00359cb48a4e54054403. 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/QMBZ92317968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b6d6da680817c4750932988c67cec4cad9a12ca4ddadc16871b5e96a069d8e. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QM6P42379140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938d328cfe2a0d708e3dc89df475223e809aca31acee80be589c68d0704142a7. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QM6P42304411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe465c00dc88047abe8e09da7c381fc842771e509ec6e79df02d98da0170789f6. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM6MZ2315161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16383a3c34a9d42312fe7b5a66b1495199a7de33c457da03ef9fffacb0e9442e. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/AUMEV2314096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14454be91d79385fd05d5538edcc866fd1a630049ee2b53318aa93608df13022. 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/AUGBT2213791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf9e85c6a99a5a68d993cf8e2cca9dea42674ee0d25682941ca023301355efc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/UKKBA2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9be7f1b07b896ff24352730c6dd44a489eefa97f2af0b2781f64e53b0015f7d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NL4WT2400336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ecb021c505e7d49cefc123ca61a9824869b579e82a07fcfc5d6f824a390a3d. 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/NL4WT2400366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1361a23959e4b3bc6b82af10a01fbb8069feefa410d4cb5999cd6b243cbd0f4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NL4WT2400341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68badcf650f8140587e9f9a7989fcc6b4ff9649f80b0747d2569858e1d6bc54. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NL4WT2400338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c981d52a813069609d0357c8c3c77de4e8bb9ff802f557a362daa62539ee9e. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/NL4WT2400344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ae16d789715c2f00bb9ff1cc45479e0cdb891c6325de0dad25faf127035cca. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NL4WT2400337.