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 0xc806937e48ff09096a52746dd005824905378ec0aabba6efad007bbccee3c27b. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9500b95-927e-4c39-a474-bbcf400b7960.json and https://artists.proofprofile.net/proofs/artist/f9500b95-927e-4c39-a474-bbcf400b7960.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 0x39be476728940be59fa2b7b9edadec2202e7e1761f94c37d4a15fdaeb4f10d92. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PL90K2400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdccf590a9a6ef441037227cf88ec2f83dac26b69dc44f06d67c42842fa88289. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/PL90K2400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x885ed0eb9edc71f1475d591270906567932df07a90f4ef4eb45e6d6f354012c0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PL90K2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91118f7b526fadc3da5ddcba712977ab4c00a88c93b45ff78582314fbdfc70e. 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/PL90K2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91118f7b526fadc3da5ddcba712977ab4c00a88c93b45ff78582314fbdfc70e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/PL90K2200067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02848cb43d40f1eac59b5183730ea44a72f10ee5c8d1bb5026074c3fb36e4afe. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/PL90K2200071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3fa013a2f8d89195b98adada63521bce8906329aa24b24e2007620799b01b58. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/PL90K2200063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb7a8f47915aa1066ed80cc6db05b168a07f801f3efd91116e6688a5f9878a1. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/PL90K2100084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c2bb9359b2ea38c7bf69d5e8afdc7685b93b8af0de29bada545a08ba4544df. 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/PL90K2200033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5428b8b96346c453de73b88b611bf269667726ea9a623d22047991c1b80c5efc. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PL90K2200046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03afb605a91cfb4329771f2f3e9a4e5b5e615a65da5afbe2041202690500bc5a. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/PL90K2100075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6893e4dff7e486ea46b689f0ea29c089998cf87a5f4eabf601fddb2549ee63d3. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PL90K2200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x583b4cd12e01ef156f0cedbc796cad94f4060012f59179b49b2e22716f495217. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/PL90K2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ebd537f951631d14c28f31928692f6b91cee314b88ee760acdf149d2508b4e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/PL90K2200069.