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 0x5a6483ff3aa16c1da710ec1dd6cb211d22837aa1d3dec88523795b22130f3e3d. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4463c5a-677a-4ec6-92d5-5a2a554afebe.json and https://artists.proofprofile.net/proofs/artist/a4463c5a-677a-4ec6-92d5-5a2a554afebe.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 0xd014adf3f21fdfcabf71f1a8a9a443976f59d68b8e1c18ba096b54005c0724c3. 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/QZES62037197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dffe135723d3dba032152270fed12c29fa95693ae2cbec45d4496a4bcc6bfa2. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZES62035794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647e4cffffa78cf0fe2bf869ad5b9523e40a092a367bfb7ac0937e9be1ae8c24. 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/QZHN92202117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45109974f2587604146c112a70b5a7086dcb53c2dc24d658410be6d82fef14c9. Chain 2 (Bitcoin): anchored in block 957663 (2026-07-12T05:58:46Z), 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/US7VG2442070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ccd40d2bf080cd3858ece85268dfa0d58ebc283aa123fd05063bc572e92e6e5. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US7VG2442071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa82919fe7e3d244711728013e40b2b47aefd5c8a58edd4eda4098566589fc98. Chain 2 (Bitcoin): anchored in block 957674 (2026-07-12T07:50:41Z), 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/QZMER2279771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332a088555f370abe20eb00af3910f9191e9e967b5ed666a8b372e083d86b5dc. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZL382476260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e5881fe2a0130d308a6e576ca548f58ac8428763b1dbcd4cf68644a61db37a. 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/QZL382476262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62cb1e682e82c86103fe517738f3cafd8427468063f3b2dd20eb65e31f7b5de. 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/QZLL92470843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9694e96ccf3fb912fc0f0b0097264a138d6b7c8e14e45512157beb4d89073f5. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZNMU2489816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066bb490184750c0fdc4b1993d359e1a0d1ede82e809da2c034f1ba4aad576f5. 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/QZNMW2455848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9240b48b5b01e6eb4233ea9186fe4a69dbd637deb91bcd6523fe0c669bbc14db. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZNB82529762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71ce535788fabdec210e14f5bb3ae52ff1374ed0b7987209dc721daf45415ce4. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZNB82529763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8187ccabd191309e35c2dfe77e9a9208ac423723eedc5e27a9579892410d4f. 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/QZNB82529764.