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 0xc6473317e3290931d14e3847b94dba338273ad23c24d1b5bac9892fdcb215c2f. 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/d9297da4-13bb-4a28-8ee0-c1f49fa4ff28.json and https://artists.proofprofile.net/proofs/artist/d9297da4-13bb-4a28-8ee0-c1f49fa4ff28.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 0x820780453cd6e56accd5133946d02157b73bca71818122f63577c0bbbd0f7cdd. 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/NOPGM2004030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e326bc90141e7a5f7d8a3670107744a3c4a7c8049bff2536e390c94b00b327. 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/NOPGM2004010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f268f1beba9d6be7b6dda0cfdae9042881c4373abd275dc98558fabcba51f06. 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/NOPGM2004020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674621ba03515fb35780af42d9db64db5c72fe9e803d50b41ca4c17758ef2349. 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/NOPGM2004040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477cd218370a9b7252d37883ce01dba0c559a9564bedc1fd8c72bdb568a237d9. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/NOPGM2004050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49442842c355eb2a75a13b8c40260c584796f98c7edb39416374f735a27c01a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/NOPGM2004060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6efdec036127c2a1e5b495bb713c99f64c9ff0155872ca9eb3e8f412c9462f07. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NOPGM2004070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c8aa80a74f2060740dea8058d6a10c7a5bed5db667ae969fd100b0a5a9d60c5. 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/NOPGM2004080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59dbd96bcd20e9679e740ce55b66c1ae0661a6827072af0a0fc71058b3f454ea. 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/NOPGM2004090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa660397882a48fe2636cc74c7fba53358cdba5c00e3288e7f31e9d754ed3a6e8. 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/NOPGM1910010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1217c5f8808966564bf12b7f641c696b0e682b96f74a123164b91933ec48e1b. 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/NOPGM1900601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c81f3d0874cacc7d6276ae7835c885b6a6a225131c809378ea5fc5980b11e89. 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/NOPGM1900301.