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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 0x9f4a504f850214cb913bdf2e3df5882bcbacd38e8e4ac5fab84103b43eccfeef. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0de577f0-ca54-4724-a967-580d6f044a9d.json and https://artists.proofprofile.net/proofs/artist/0de577f0-ca54-4724-a967-580d6f044a9d.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 0x79bf44f8a06d8b4e0e51e008f70bfdc0b5cf3e4197dc81c5fd6e933b1c6c160a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/CACWV2514539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3530e8f9fb9863adb637fa5946e734f1b2269a0b9f7a6dfecc3507b74a67b3. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CACWV2529291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666528316104155f17cf062e313ebef162fa843a77d255c20d4d6ad68a77db82. 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/CACWV2529292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf248c1b5805265a7e9582ac06e036b3479da41897e306247910575f2aa66020. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CACWV2529293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc949e3c6adff9e3d1dae1f94389d31aab8baf44dbb745be01f76e569b1d2dfd3. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/CACWV2529294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb90af02d6c4eb57c4e86b5bc126aa6883bb32ffbf86448467af69dca8f6e297. 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/CACWV2529295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5745471e155b5ec9d89e7d76293b73a4175492801fd0d67938751ec8ec77cf3e. 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/QZZEB2397557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef48787d81fb56ae253984dffc12aedc854e4e0a18fd30b0e288de7ae89e48c. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/CACWV2529296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e55883357d6e29842f6ddb923479b2f84778d1d5484ab0a969738258d4fc74. 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/CACWV2529297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc665f6805b36fcea74d99ad7c50f447eb4d0a61dd8551ec858823719e2ef1797. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZNW72206677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x557e8a1f35ac305ad39169040e960e83d5cd481b18e660763215f0ccea004ef8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZTV32368887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bf44f8a06d8b4e0e51e008f70bfdc0b5cf3e4197dc81c5fd6e933b1c6c160a. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/CACWV2514539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b917801a8af1ff7e9690e1777b7cf29f3ce5651a9a27f7cf88d1605bff6bced. 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/CALVP2563756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0855607080a9ef769989805a2c455123678dff5c729723c42b58160fb0be994. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/CALVP2563758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb220bec41f0d3868f610c8148b564ec3fbcd655374964107f5844b65738708d. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/ESA012278826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c0b21516bb91799b1b52ae063af85c584741892bb3034cb9ba9f3ef5a57be0. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/CAENV2562602.