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 0x454d44795ea077158b61f6ebf295a9c91b4f347eeac3920e04ee6a0be4b7eeb4. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7cbe42a-8870-448b-8a63-04c027aaf6a4.json and https://artists.proofprofile.net/proofs/artist/a7cbe42a-8870-448b-8a63-04c027aaf6a4.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 0x4bcc17d45ab30bdafac834074dac1122304f513ee4a3cb80e58e451fffe44e5f. 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/QZK6N2464247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9fcc4d57dbfd2135577c83b2556813af90d83109d72230beda8e1fefa87d6d. 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/QZPLS2343564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3209c42b04b816b4583a2e5d37a9b292c70bb59cabc1a3d163d1824a21dca19. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZMEM2390795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d771fabf837ddd47bf172fc824219208a7664d2c5c391b801a795f1afb8875. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZHN52328517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26aee0c212790651042e856c7d4b930d5395db8a68384d75550e688775246193. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAU2225286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc3bbee952e20f3b304aa6b73ff9712b8d9cde3221d053c720513ec8dc971a8. 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/QZRP42254224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f31c9e75123ce489a4b1a3eed420fc869664117ee54839dca2c8ab91816c95. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZTAW2499911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf320fe16556c7f41a34044de349fec99e1b06b126f045569c7fed28a388edad. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAW2499912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d413b2a05483bef0820b40dac1e41bc73afe1277a44dac18a7afede1c34d3. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZHPJ2286706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead56e8b767fa0fc1d3e421969cbd5cef8f02ff1eba362c039e6c5ead1d74df7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAW2499914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78edf00ea0a90d828f3bb241f30e54fdb876ff2971305511aebf709793303224. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZTAW2499916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94daa932c309dae7da196828fda8360c7ef3bf8f569783f6ef2de2895879734. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTAW2499917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaafa7ed3805e089971d290cffbd237e8fd649ad4af4143f924ed136fd9ed7974. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZTAW2499918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b549a150c3d0151543be292fe4abb286cdcb1580aa731483aa4c57814421a3. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZTAW2499920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6415c57522188197bc4035db49be732f9a2fe0eda2119adc4d7d6167d3372d32. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAW2499921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bad7d21bfef53e109e160f837a547ead0f74ad0d26ff85436f08524cc4e93e. 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/QZWFN2354708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbfb58c91f5c3f99f424edff7dc61fa2866fe52fe94deb63812c5d2924b00c9. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZWFN2354709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd29557f5b6d85fec011069a5f9b532fd1006531f551aad2207017f407bb2ca5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZWFN2354710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19903c2fc05e043b8f6e63bcc845085c87a290ee17d69d7baad08b8af2f4e300. 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/QZWFN2354711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42549e71e9d7d03940374709eaea3e0f448c1d31abc3e5830026a1c915b41161. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZTBA2292992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d413b2a05483bef0820b40dac1e41bc73afe1277a44dac18a7afede1c34d3. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/QZHPJ2286706.