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 0x82be282eabf95a60ca99ecd702742fcef9b7d8a69f4aea89aa613b0cec8e909d. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/36da178b-5a51-430a-b482-105b8dc8bf72.json and https://artists.proofprofile.net/proofs/artist/36da178b-5a51-430a-b482-105b8dc8bf72.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 0x74caf34bfbb39f4defd88e0baf55f5f6691cd337d5dd01c890eb70928eb8f483. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNMW2315577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab17ae6bb5082c6b6fa048fb050470debb7993d4916e6997268b4e3d114dd9c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNMY2375195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x591ecaaec99eb0e53e79e256e606eef6071aaeb3876a0d83dea8a951bb76591e. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/QZNMY2375201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d4ec38c5ac131d5543388d1942a581c787d3924f54626a411047feddfcc7b6. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZNB82418556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf35a1f7e920867c63e167e849d4d42c44c23a96a33b410012ceb6d880f8052ae. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZNMV2401326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1e3c89aef4c6766d6b68d95d56dc0cab787156f5f912e3dd326cb607060f591. 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/QZNMV2465067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x754545e5a7b4e619e199de26759c2c5ceaf2fb64b1a3c25d2f6d7c54313940fc. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZNMX2411952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7532c19e218f932a1a07924df29d55c6e46bdb334c7b7d2e747f7ecf38fa978. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZNMY2454867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefdd66d7049cbfb32fdf5a2df749721874765016f3fb5735064c66fd7676ef6d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNMZ2481114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12a77dc643723a3c7b6612b8973d3b298143f3fb0dda2bfa2bdd7ae32970cae9. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNMZ2481115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe639cf333d24bdd8ee65a483559b3c22f897ce5abe79367761fcbee58e1e2cde. 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/QZL382561647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0102a3e6aef0eaf7795bf42ac158962369ac3985b37e698941b0db64f5508b. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZL382561649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f047dd2ba269e3a6089ec2e8b73d7bfbf742af0a279fa9611f4a1b223ef8334. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZTB22566067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a9f562231360fdf53eba1bd3be0b2d5ff6bde04dc962162449d17b1bd6600a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZWFL2584395.