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 0x00b49f56b28e6664cac6c7a79975214cce529673a1ef2abeb3571668d16eaaba. 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/129ac3d0-6ee7-4126-a148-0cbf512aeef7.json and https://artists.proofprofile.net/proofs/artist/129ac3d0-6ee7-4126-a148-0cbf512aeef7.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 0xe27fada417b0f2bd4e3be96c00a97bf2f05245e02c50ea67cd456e1b3788fceb. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/QZWFS2447538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8c983e826d78711254456f7d84868b32f92d27b0820f6cad5f64515b29fcae. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZWFS2447539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963d13e3d064b4f2a970738232b08f1a633fb37a38c2af46ccaa4239f6539856. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFS2447540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x971b53eda76001dd34842ca4619d73d2861ba62164a7e38079b594b51c4f7cd9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZWFS2447541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaefa101705a04d9f92af69642d0cfa4aac02c1f36513ee180cca228a48006f57. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWFS2447542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5661e095b8bcfc95392fe496ed98ba3603041aa8cb91e496c121bbaef92161e. 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/QZWFS2447543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe08a6505f715631ad06770f23892578539e971baaf32c057f0c0d7598ebeaa4. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QT3F32454949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30466f67aff0e98f55f77becf8fdfb89d5248ad10f8cd4b56cc159e0e18d3cee. 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/QT3F32454950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaef1532651638b68772d1ddf1f2fbbc17e3210d99b036af57f89960b19b1739. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QT3F32454951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd80b602eb19588babcebfcea6a5f9a0a1806dc931964d3dd65703b6e2fa2af9. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QT3F32454952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4b13f426bbed7cbbe2c6b828b4a77dd65ca537ec856873fc4028b9a214ddb96. 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/QT3F32454953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa413926a71f893dcad961471888c0981aed249c5b8e5120b096e926cf1a70b33. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QT3F32454954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa83190d98dbda4c5b25bb9c1a78ed9ffaa467bac4900a1f12fdf3ab0546a2c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QT3F32454955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ddd1733192c1b71eac480efd978f7ef1ca9fe445b9b9b41e8a5381a87b716a. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/QT3F32454956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d37ab049ac453c51d9f7e1dc5488eea3984f1add4c7cb37c611226456d4e3ed. 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/QT3F32454957.