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 0x556bd2c3fc428e5d518653eb9468de167fe236edd2b519140e2695682ff4fdd5. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91ec55bd-39f4-496f-812d-89d178d9c997.json and https://artists.proofprofile.net/proofs/artist/91ec55bd-39f4-496f-812d-89d178d9c997.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 0x18228fb98b25d053fe5a3ea3f402b21c36e0b786745b42d696d7d1613bd3877b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZHZ62117298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec45bc97955bb52816912e0a1b4543d12f6c50d23a24243c0ae90311713d4fb9. 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/QZGLM2372110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe83bd3eb16bd43f4a0bad81632b26a4afa863410d971fb58add4d3e8e24a579e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZGLM2372111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408c9f02123c949e821bf67ff533a9404b69dc825bc4751f38b311ebb92f73cb. 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/QZGLM2372113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc187b926e1e81fb8535f50bdf5788e02d91903493a49ae7cbdb1cf23a5a91e6e. 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/QZGLM2347863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee4959cb7e489251f13fa5ed2f0e9bda9201cfaf4268afad880e74e66c73bad. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZGLM2372107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5dac263b12aac7fea6eafe0a8d022f4651ca881b951d336cd97bd5c4c1341f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZGLM2372108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668a726a184eee8b221d1667c4274c0bef612ef1d6fa776ec151dd414c65a41d. 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/QZGLM2372112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f662dbd4d630d76a60970bdb939d03f1674504891e619cd11ff6ecb28d8244. 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/US7VG2121597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5571f91be276417b62867c2ef7261ab25592b2dc44a45ad03b1525b26c5bad. 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/US7VG2121601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab30187b150db808ea2fc4e92c12ae99da25163cf5d971e5fd209a9edd559e3. 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/QM4TX2409984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623027466da83dd8aa93e8d4664554567bec24d205a536ffbb5dfd3b61242b82. 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/QM4TX2409985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a1a50bc3624c3183c3ee472d2f003d4d0ad3e86b339d60e85cd28fb3fc18f6. 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/QM4TX2409986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511b49b2837ff9604b26e7c7dd2a591e0c6cc2405ea7e9c69a53b3d00ff4eafe. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ARIXB2312679.