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 0x3c154eacd81c76e3dc64d836044f2a19bce27dbc0c48a9c0ae9a2c10eff17b64. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3375a56d-c82e-4fdd-b059-dcc59cd858c3.json and https://artists.proofprofile.net/proofs/artist/3375a56d-c82e-4fdd-b059-dcc59cd858c3.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 0x5741d5c82050f3769eb57f72a8be3fbecc590a618cc4b3cb01e1dd8c7cca6174. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZHN52535447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2581ce827b2693129005d41b3e3187dc8417df6cbbe78a16207392619294c33. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/QZHN52535454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a84e829ba0bb0d38176b557e190dd302830a29d9db84e10bdc3e9e6755df7e. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/QZHN52535448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0309d1c8f494523c8d33a0961426ed409e997c89d48b627f063d21353df71b1e. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6K2501819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c6815bdb92feebb9b01bbeae4668abf180b2d120efb2d1b369fda8604fe8bc. 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/QZMEM2520423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deab773ae143674867bfe9a0990ec238d2cdf34b792c430fc4712f4b1c811e7. 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/QZRP52521417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20952ca87a83f2a75c6e860dd34b631ba659a4ea0b0b811a7fe81f4339b072f2. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZNWX2538818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b7a2e2dfd8b91318bdf03bda80c5a44159fab1125c50f781d7712592afdfe4. 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/QZRP52521418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5741d5c82050f3769eb57f72a8be3fbecc590a618cc4b3cb01e1dd8c7cca6174. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHN52535447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2581ce827b2693129005d41b3e3187dc8417df6cbbe78a16207392619294c33. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/QZHN52535454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a84e829ba0bb0d38176b557e190dd302830a29d9db84e10bdc3e9e6755df7e. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/QZHN52535448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8c6815bdb92feebb9b01bbeae4668abf180b2d120efb2d1b369fda8604fe8bc. 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/QZMEM2520423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b59e75fd0083f4eb1b95661b9c2080814739270290da4b2a40f2abee4493b4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZRP52521419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0309d1c8f494523c8d33a0961426ed409e997c89d48b627f063d21353df71b1e. 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/QZK6K2501819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c58cc3f5c7834572c2804fd96ff7f53752f37e01f33bf76b621e72b258d5659. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZWFQ2550165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa3da4d38d307d122b894b6ed7654d5992bfb336766b0047ee22f23a79f4431. 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/QZZ7U2504187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8704e3912b7626ba7611995792e200e1f41ea91325e4ae03e66079ecee2babd3. 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/QT3F72506326.