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 0xf22837fd17d4a0edcf2f46a0316ca70a25107d573669d3bab5f336be7bdb35bd. 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/4fcc830f-e9cb-45cc-b02a-6e42ddb82ed3.json and https://artists.proofprofile.net/proofs/artist/4fcc830f-e9cb-45cc-b02a-6e42ddb82ed3.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 0x8825aa92dad0f294950e649ded02e315deea6f0a45fb5d047d84a81d42e33af8. 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/TCAEF1901768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51e523c09c1ab54c646e3296dd2e70377afc4079540ff1284ed818b4ca1491f. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QZFZ52148963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20abf94dfd37d98dcd74480b568ebbcce87d3779b25fa19570cd944b10d6082f. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZFZ52148965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28b0394d60025020837b0e8dab22aabf8b0e034f98a3a6a944806a37ce63f84. 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/QZFZ52148966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d75690d5c71857ef7d7f6b0d704a2529635f178c31d867b5c732e1479e6daa. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN82162938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac6c980af26549cf5d796652cd117d1a43c3afc374c1279a89441d7211b3d914. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZRP52250212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6b51caf5dee9fe0d130b991fac9522f5cffee1ffac7ba70156b2ed6c9b5611. 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/QZES52319877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5b1ac01888dd76b857735016e46993353513d27b027e0ece264c251f387bd23. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZES52319878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf206e2a07de96a3c5a147dda5f2aa462b45a09d7db7932509c56a56c3d9d75fc. 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/QZES52319879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586dadd91e478d327122e652a1465051153acc4558fa3bb85c4043ce844e11cf. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/QZHN62290869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d5f5ef4e016e5fc470501d26c362031ce011816f7f4bab8a4535d3466775f4. 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/QZK6K2101608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa649b56a7b298f4cc1a0dd1a550d20c4a137203da76f6fe6404508b344d863f0. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFYY2371406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c60b609e5a4e004d6d85b16c8c3f7bd93b808189c1f14e9f4c87b2d65cb74b0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTB82401934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f39126a72517de0735fc9215e8dd0183a8aeecb53bb20aeb421d6b9fe597e0f. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/QZK6G2598164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d6be70a67c3718dd2fafa0f034447198d01909a9d46f258151f978995ba9fe. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZZ7Q2566192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e1afdf1ca16034c4886fee94d965d49f4e61f4cdb216fd5cdd03ca7feaa3d7. 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/QMDPP2101255.