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 0x653fc00463bd2a775fa5f67dfab98b2dbce20c4f6b2068a74a9126a1f41fdabd. 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/f0fdcfc9-ea53-4b7f-a8e0-af60468e3eb6.json and https://artists.proofprofile.net/proofs/artist/f0fdcfc9-ea53-4b7f-a8e0-af60468e3eb6.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 0xfedcf7a436b599ce77de12e43a80576180e5ab0f7f66399bc2b314185881c550. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAHX2435581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83690de076d4549bb6bb885c9c127aaa268bfa985b7b0dc9b612cb5d5f779fcc. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/TCAHX2435597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1774de9b74a68ac923d357d5d0e5c470179501121fa73e6b027d4e6446b675. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAHZ2406453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa238386585f6c85a761b9c66fe2a4c73b64741584234d6589011abb211e8840d. Chain 2 (Bitcoin): anchored in block 958504 (2026-07-18T05:41:32Z), 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/TCAHZ2428225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427d001aae7c58f7b8adf0ff7f942c4392cd6a021464e2ac31baa2eed5120cdd. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/TCAHZ2446564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14dd6a6129a650d327e8ab5f17c70cfca31b8ee8b7fb1a99255499787ce3812a. 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/TCAHZ2460118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf11f5b1d69578e924c31f79741d229602c6fea28fb061c4c2be909b5447177d1. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/TCAHZ2491007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x852493cd7a6f2a796ec50fa56889b54707159487559f51a1909a4c30002f6783. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/TCAIA2426565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cef5bab7d9ccc7e253e8068bdb9187e3f72d78dc1d27c2a010a0db82f30a0e. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAIA2445211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf25c0d0a79dc2b2c621342611607c8cec331093736506f3e9f33c16f6f1e19a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAIC2428780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe28eb5fbef583be90f475455fed930023c3890a5b56d1dfde4b5a96860201b92. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCAIC2498025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f2e2c58397e35d16ed542bc4e1b557d6d2f9666d45623bdc40e133b646d437a. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/TCAIE2442782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2862e9fc4a8a0fb0f17457c71f8a26af9bef47cbd4c88aa290c8b7a0fbbf13. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCAIG2422438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ca6eff6b85116b602ed4b07459096abd9199814f42c5fa07a7f3f40c873119. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/TCAIG2451982.