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 0x7178985921bb42b30de0cbcc94bd13d79da0264034ecf3058c698c1ef2ff0f60. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7718867e-651b-4ff0-afc8-8729e026c3c1.json and https://artists.proofprofile.net/proofs/artist/7718867e-651b-4ff0-afc8-8729e026c3c1.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 0xb6067eceb108e72cdb3f124801cd0b70ab366afd978c688a3a7fa23d777ebe71. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZZ7S2466684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef01a4cad55e3bd81c4846fb8808d93bbf39088fbccf6b4ae7f72deacd1f31a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZZ7S2466685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8038e490c2b32f486545302c76387e9ab644cdf603cf933f51ee97b62fadbc1c. 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/QZTB42444814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab719a53256933f82132cf7c1ecc6077a4e83d87306b94fc454e78fd177a3d9. 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/QZTB42444815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed80ca3602ac259b89f4f931748e68f4a6a9ec45d2fcf3daba8b2f8bb35f3a9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZTB42444816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa877631edddcbc96663cce09e4bd1030eac4d43bc660cf5ffe1a21dfab044fad. 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/QZTB42444817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c040ff98c16ef00623e503117dd1afbb815c688a4b5fa09578f8691cb3c598. 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/QZTB52364253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5349312079fd06ce26a366eeb11cd0f200869ef161ef0c40b6a8ee9f2f398d41. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB52364254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28840179788748e6449ea4237cc89bad44bce084ebdade2631f92d5ec811adb. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZTB52364255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4ec5cadb4f82a1d82c9935d60ed0551424fedbc50211fdef3dc51e9bd51d53. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTB52364256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60af2ffc303cd23499459be1f09fc9e26b1de56b67985ef3c7dcb335bec1567d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTB52364257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafb4c6bbb96d4b65a97b89e26e03e8ceb7bc9b05b1e6a5e72aed372640a34f3. 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/QZTAT2338072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121e8c005c4c4600c5b9d2c346741906d908d8f47d0893005cd9ab1e121b795. 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/QZTAT2338073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd37130bfa67d80df692cee6b28cc65d4a860218709fe4f527eae4fe54b53290. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZTAT2338074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f93d6c9c6f0c6db77d99ad4f189d9980855ee0b4fa6fc8767c4ea482185272a. 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/QZTAT2338075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e391911a3e4882f98be697d9165e0b7e4d8854346ffa230391f21786db7e0a. 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/QZTAT2338076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7395592729dc8c28b07069bce987572fa91f280b741184b3319176c7988e053e. 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/QZK6H2320999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x228785a999d571c17976d790e5d5b5e73df1c76ddf8c0b58fec9ba84c0059b07. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZK6H2321000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563bb24833ca5284a110665fbe299a85765aadcf9a929d691ebd6bb212dc6f73. 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/QZK6H2321001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdfbfe831718a4cd52fac292d3deefd35e16f6aeccb1e089535bdf2188911fd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QZK6H2321002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f01d37b9e648bcfd7879778e94fdf150da416c2a214b422b3444039ce611856. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZK6H2321003.