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 0x1e44185c5e0bf76a7c740ae68e57492b263edfbf58552eb9ea0c672dedee04ef. 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/25ac64f2-46b0-433b-a2f7-c79433fae075.json and https://artists.proofprofile.net/proofs/artist/25ac64f2-46b0-433b-a2f7-c79433fae075.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 0x682ba777651a2b1c452283c4ea0f2f0ad082436ee7cc39b39e35d7add10e44b4. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/SEXCG1801701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347aa28522681ef215efe7d04773ea1a8a2eff44adff4f6f183bd8b020552dca. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/SEXCG1801903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfe9dd5b2dcd5d6297d909f54ab12e6ac9c3d947c3537b46994eac156f37542. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/SEXCG1801905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98d4aa969683c69b7834bed282d017c6686e8efb7d943041f25f2cccde97367. 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/SEXCG1801910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ffc6f0c4e9591bbb5bcbad48933d985d69a63638d628cca6d929f2074ad73b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEXCG2100206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194de780821cbd3283ea93048eeaac45fad162ccb9f9cc6fdf1856fad62a11e9. 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/SEXCG2100201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615b6f62528c7059b77fe74c4339f023b5caba631ca735855b966f3acec2f1e6. 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/SEXCG2100202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa045524cb8b322c281dfe1ffa3115048381eeeea6c0197305ed1376aede2b2a4. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEXCG2100203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b3374401798b50169e07c6584c65717bff95ec5c1014b0225c755011259d85. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXCG2004001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a2015187721f1e07150b507fe1ecc740914ee0e2989754d4c5294fec5b5045. 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/SEXCG2100205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ffc6f0c4e9591bbb5bcbad48933d985d69a63638d628cca6d929f2074ad73b. 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/SEXCG2100206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x355fa254fe0a0e67ae23aec06af1006c3e057416df7b8e3b05f34b0dab08d1b9. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXCG2001601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c58e8697808e2c5968338954b5272d38050eacfcdf43dc6eab9290489daddf2. 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/SEXCG2001101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3345b7288fa9a8717d71c753565064401754fccd2903e1cb75f881a1f03e93. 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/SEXCG2100210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x879be5eddc987bef390f5191725d451cc436f9cd843f4aec8be37f5265e7bc39. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/SEXCG2100211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc959d83f591b1008141eb540d20f53645c1455725f9dd519181732017f0bd88. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/SEXCG2100212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc77cca3a611a8aea53d31fa528811db5864f9a36fa8c5ddee20e0333e057cad9. 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/SEXCG2100213.