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 0xa5c0d22e1b204c51232486d57fe49531c25ec0e2e79f776daba29a994e8a3e12. 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/db48e244-fedf-4f42-9f5c-9bed9fc43779.json and https://artists.proofprofile.net/proofs/artist/db48e244-fedf-4f42-9f5c-9bed9fc43779.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 0x3999c41412d087854b930e4b0b23585a52bfa3da0abf468c4f7905e2ce413a58. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/ITV0G2100027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf883f7e2ae123a54b6d7b4badd4eafcb30afd18ae069c84b1720bfa52a5309. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/ITV0G2100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d803c40e12eeac1dca3f33025821bd506f16a8e3349a3380611ef3d3274dc1. 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/ITV0G2100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf76d1f630dad3fd430e875a5dc1822ea1999f4b03084753897475be10823b7ce. 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/ITV0G2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f1d0f341323702ad6646ff88216b7cb32130ee499d2f5876d5f466c7cfcdc2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITV0G2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5bce51bf9ae31e60bc2746a506ffc23f9d9f13507b824368b7bdae23dba499. 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/ITV0G2200016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a505ea1d1adae946f1ba4b02526221bc5ce5d104d1af2a304837c5694cd4fff. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITV0G2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc2d6813d92db8b67ef9952247e6410bced6fd12e929bf3c58eb9528ef35cb3. 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/ITV0G2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fc5774b1b8e97fdb66f9ddc8222bbb0af9a72dbc2b0a6b6708b08a9ebb15af. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITV0G2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc1ff6c1b369c96a6c5ff21b14590dbdace18cd6756afb09ccc63777129a3d7. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ITV0G2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80b130ac391d28a2adb7f168801d17f0cae0d894bbf084fbc16809ccd75349d. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/ITV0G2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ef2e8a7d69e855120761157773bf48f71926288452216b08bdfc71393de0618. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/ITV0G2400050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6113767e9f17afc36d0f791e8db8d4b5b8dd72b3e54396b7bd566d97ba06c3a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/ITV0G2400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e06aa2ed1ae0f04214a0070c69efb0fef3b267198496fe56e37c113ff5a2319. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/ITV0G2300012.