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 0xb0a9b2c6d7fd7cd8c69fb483afc699cf302005ea143db34c6412e936d9b680d9. 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/42d9b936-7aa8-41a0-96f7-6a62ba29a010.json and https://artists.proofprofile.net/proofs/artist/42d9b936-7aa8-41a0-96f7-6a62ba29a010.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 0x7b83454a7fc3690f2032d9bec1755f5aa11e9ef3e1085e369e54d0c5068c2fba. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZFZ52123889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12833f57e2dc3381f51cb50e131c5e3e076b32b4d6146e3ab47a19ecf78abe4. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZES62202133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf290672c523e1abab0223d967a31b7979fac850b1de4d929672b792cb0474a35. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZHN72218413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf071ac80198843488fbc894972d6869bd448b7b6c8523f729e82a2edb11ba40. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/AUA002200112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e81c219f2712426efb8c4053ba2ce2541e18d8ff8024b4888b34d7b1390008. 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/AUA002301061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a5bd2fb5e7825b7fbed3fea384f3027ffa92aaf0c92a7dd81f30d778ffe94b. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTBC2382532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5242806ccbf531f4c9f999038b3f40048ffc8b8f0b2ae93a6359fad04a23f9. 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/AUNGV1700645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446ed0e71418acb2c8979ef4ac000381a0177c296757ecca6969ec23de75b97b. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA52469164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709fe6e2f1b72d477b7520e640f1526127653d60c4d6157c241251d97216a043. 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/AUNGV1700651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7f6f52cffc276b3fc460a37b4484d82d0a10660f9a88c9338b886ade80754d8. 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/AUNGV1700655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34b95bc11104938a087fb7a2e5f0b76a32021a3b1e45cd5fe6020c9befcb9c3. 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/QZWFJ2375842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8eea4b4bc0e736996e184357efd9b5c6a744fa2f71bb88c52ac9322ef393f9. 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/AUNGV1700672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa6c0bba5c2969a566adbe5f0a539bc9aa56edc7f12c782e89a318439d1b2b9. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/QZWFU2437976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c5563d28b8a5bd8c87049f40d682e3f3f4c81c93d1f98199ee5591895cd105. 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/AUNGV1700706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1eb56963cff514dfde27ff95d64a49ad687bafeaa9f1d92b79dd072c4790ea. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/AUNGV1700599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cebe90a52cf1187ffd89f5fd17dcd959959bc81824b5fe36904e6e582683d9d. 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/AUNGV1700608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e5c73acdfb7b9fa23b4a1e61de82b1eb30fd1ec68b5b43a0261175f5c50804. 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/QZPLS2414857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cee8930b7c9379100f13c664f54b6eb10c2728a013e805a8953de0ef58e5b3. 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/QZK6J2451566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70dec5d1403c4f278a623a897a84ab075c0c2e94f90c91ef5c731073de028dce. 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/QZHN52489240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e7455f3fb683f0315ac8dcd9e1dfb363b7f8ccf92b218e9cd98165b57cbabfa. 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/QZFZ62488404.