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 0xcb160629db9758517f64bd30ed00089b661bd72c2889f49158e3b015c2636bc1. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c5c3213-5c46-4af2-a641-c2f5f774d5d2.json and https://artists.proofprofile.net/proofs/artist/4c5c3213-5c46-4af2-a641-c2f5f774d5d2.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 0x40c5320d6d2d2de33b644d7377ec7115b81e5c4ea3a2d66778c6a09e9ae24a1f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZUFN2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f56f781034407f1883facf6999f5e604038e8507924c407cda24c698cd0e6d. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZUFN2200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0352ae1bd2f25069b2d36100a28ecebd0619f2e10e333ef153795747ccbb9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZUFN2200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa116f16b45674b381ef3022908ecccc90057d9a1e9ce8456b024798c0b0ece91. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/QZUFN2200094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40c5320d6d2d2de33b644d7377ec7115b81e5c4ea3a2d66778c6a09e9ae24a1f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZUFN2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40aedc38a30c9a0925c6c93d2ead6c6953181cd53d30732a690fbac3750ed49f. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZUFN2200095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e0352ae1bd2f25069b2d36100a28ecebd0619f2e10e333ef153795747ccbb9b. 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/QZUFN2200096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f56f781034407f1883facf6999f5e604038e8507924c407cda24c698cd0e6d. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZUFN2200093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed381a2548bea134d78c43be1b5941299d3f7314cc7456abf439a3208908158f. 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/QZUFN2200097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073893b829ba2a0270c40fdcec6d9c784ae9e5147e8943e181d247e8d7a9b79a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZUFN2200098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81662ec4b846e1eaee64f5613a0075ac57e7d0985816c23d29b42450c46079a9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZUFN2200099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953e2c17d19eb7d45e835f0e6c41bfa969ae98c983e7861be7cbde56c269e2fc. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZUFN2200100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7361e210b4deb68ade1d0667e321623253cd4c1fef03bc811c93e97c75cbf752. 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/QZUFN2200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x191926e82abbd2df00f38af5a368b072b828815a672d57907cf1739d18aca847. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZUFN2200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d84dbc54a451ecbfb82531847e80316a7b2f3acb768b23b89739ae831b1417. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/QZUFN2200103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dace1888a140a7549babb5d3c64606346d4ac8d4275c47dcee5311ee826114. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZUFN2200104.