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 0x4974e6f6c3268ef261b6e543e31514ca7c89f6338014106a356600730ecb20a5. 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/0d7b1cc4-47d6-428c-8872-fef5aeb2496a.json and https://artists.proofprofile.net/proofs/artist/0d7b1cc4-47d6-428c-8872-fef5aeb2496a.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 0x90437447110ef73d1da32af3e14a10308ea871c1a99c76c75e49dae2de5df227. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/USCGH0949608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34b0b3c7a717f3000824bc476f1b4c4f1e9e29ad595c679dd0e8dadcc63f6ca. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH0949609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85fb04e32bdfe3fee80b9b4b5ca1ae16ed3639f0501542e10a3acbb65f55303. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USCGH0949610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e46846b853f7c4c98beaa35f62ce6d0b48310802c7dfc2cd9216eb063b7e3f9. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USCGH0949619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d7dd0a299aec57c49b4f0e61434a48ada5c338d566be0333e2e6026e1789a1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGH0949621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76d71dc67a2caf845ac010f9731bfdc2e7765a5490a8368f180b22ad821b9d4. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/USCGH0949624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb4ca02e825f71ecf7f4a1ca1519383ff26d1ba0bdf3071cb8e069cd38946af5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM81449917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbe6cc2b9fa76cb52d1360acd0270270b5b6b85eb35c0ed9486c936212a051b. 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/QZES71851111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2b8ef58c6d8c5f5bc0bc94303d0a9b4bddaa3e83fde07c3abab3da8cf6426c. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZES71851809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aaa99bf91dc6e801f34cde82ce12a2c76783e9e0b004786de457487bdb3de28. 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/QZFZ42034694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf322906b21646c19356ce811e4d8ad4259e3a60fd28b52d5d258dfe043939851. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZFZ62089321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b7709a002b6f78c16bc2a86220d1e9b25981b2aa2183ae2f7150a57bcb495a. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZFZ62089323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8174be0dc73bac4cef25999a5ef45466ca8968c3d5d3bc0cbb01d0340112e21f. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/QZHN72367908.