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 0x401ea1d2d0d96b8cc6ba8b468772183517e018d8108da580f1d13b6b8e7cedda. 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/04e947b5-ac09-473f-b694-63d2c682d53e.json and https://artists.proofprofile.net/proofs/artist/04e947b5-ac09-473f-b694-63d2c682d53e.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 0x0bcd9f8955abc82788a315bec74be9ae1b2ec59129409ffd42de42bbc57327f1. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/TCAED1998760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e57a6fad9ba2ae6cb5b5671826bd97f4f32a4a7d9ddcdcb152f0be04a6a3b0. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/TCAET2028029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0a1e87688d107690de97348630bc2f7822bb9b41380b1c7b2c2da6528f0161. 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/TCAFT2163787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3e4c451559bc1e682c20d0b43e585eb7ee470be556f5a732bbe6a0d3511f38. 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/TCAFW2186902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe829248f707eff37bf1bcd619b0a623387b9efee4ec72c1495f6067809b6ce4. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGH2212031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5c5bf3d5ca6a5713b79db7b894a5ceeebce3029b5fc6c574b4048c7fc97e41. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/KRA0R2400566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3265c9f0c3f9e1903a15a4fcd0401186608410186a7c13eb035f7d809d72f6. 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/KRA0R2400567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6963eec4e7f79b76651a05278b2d5013169fb359fdb198a758eb7a14c8b0b1e7. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/KRA0R2400568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ddbdffe860b251e8988624d150da994addf2cc55a08ac6601ed4b4078dee233. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/KRA0R2400569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2512804e00da3cf709453d9720bb00015c49c29b166758b59fa24fd3181c8af. 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/KRA0R2400572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x420261e5cc7db2a666a91b34cb54db8204f23bcb63e761a5551d88fa488e24ea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/KRB462301233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ca7067128617bf273d4da50096b7e0da833fe163768079d7aa2342b1d22c4b. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/TWAE32203247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1a217f8015ea5c4c27aa9301b4c96a3af75be4668fc4ae772f161e9b5b012b. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/KRMIM2106873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x373b854959669cd180956ee12f4f3e06a1261218814eb79db8914c685f7fa9fd. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/KRMIM2106874.