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 0x7f329ccb59f3d88df262f9bda045ca19749afd34d5eab1c5c419073e15991b97. 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/431c6e69-3b6c-4a61-b222-664655ed5161.json and https://artists.proofprofile.net/proofs/artist/431c6e69-3b6c-4a61-b222-664655ed5161.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 0x23cbb392517f79a373fc2c1488832cca254d82aa021b14d5b0f5877ab6008bd3. 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/QZWDE2406359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859d232f46c15198d10b1a9db886dcbc35c9f5240a16f7a1929ce7884716a809. 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/QZNMY2242351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd916b928d609769710bef4577b9bbf7ee1e2823456c82590e22db8da80552406. 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/QZWDE2407606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98eaa5955d4642e40207b40d4473834dbefd42511a9ac547893b21b77e0fdcb1. 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/QZWDE2407647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba2622ebcf18560b94a9929ab924d321bec40e39bf8fa9a3e204e68375d2667. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZWDE2407507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a48c5ce62ae9f7b75d0cfcd8a936ecb39f6752d801b42ffcc56c817776a7eff. 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/QZWDE2407638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f901c34a510280d1273613829954927cc212709481aba6df9819109150ff243. 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/QZWDE2407646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f300a13775ddecbc2e7f747cc6d031913f34e59497571d7a8b1fb1a2377d919. 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/QZWDE2407498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7d085debed75e40d255e50925527fceea2ff06748b71c23b7e3fc37a54af79. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/QZWDE2407578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121a1f226c78c9bd7db120d726e27b385b3ee3457b4bb404549f58576dce5737. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWDE2407648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7bd263566ba5c72131249e310ee3c51df396c6b02e64a72490e1e44de8b006. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BXZPH2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07b3ec47019345daecd7ccef497c80423c820c915e8e8883fb384989e7e8ce0. 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/QZWDE2407583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc235df1e86a35c65dbc307019fa8eda345d4ffd5b1a42c541f119ffdcbef5a4. 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/QZZ8B2364117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf68fe4f6ec88d04add5bb8b0bd72fc510754516fa44715cae0cd7cb3d4308bc. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZZ8B2364124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc1ab16b5d888905489d7e97e4c783788a6c18f7b26cc2c5e4517a8b3acfb19. 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/QZZ8B2364126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbb27d17ffff94605da23bb06c0f28ebafea695d7d8c606404aae151032d8f72. 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/QZZ8B2364127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5a0a27c66d268fa49723bbdee296fc2a66465346bcaafb434c5516acd4fa71. 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/BXZPH2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb7bd263566ba5c72131249e310ee3c51df396c6b02e64a72490e1e44de8b006. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BXZPH2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc286f07d5f5d12e2c7ea5cdfc4de67294e7425c6346fbf98c2edb5bab1afd49f. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZNJY2425344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b60d5eed27e66adc89150d31c66631846301ee759e0f01d97567ef4d67cb233. 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/QZDA42434893.