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 0x0ec40eea276f8c259b195274ce19ba47f9257cb82800e9f4b5f23873d3c78fa0. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c294a76-7ea6-44bd-85df-67e38e521360.json and https://artists.proofprofile.net/proofs/artist/9c294a76-7ea6-44bd-85df-67e38e521360.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 0x0e9f2abc5e5bae1d6ac5cc20d6ebf47cdd466b6219d89e02673dd3995f31a8ac. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/NLHR52105558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51648d5d8d422189951a6c97828a465fc9fe70c688d93602e540c85072a4cd22. 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/NLHR52105559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c83baed31846206a13b2e11d16c23e35d6b176e3163377def8ec218e84c285. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/NLHR52105560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082683f33b51af0a3ccfa1ac99922a5351db0173e61006a66691f1f769ec001b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/NLHR52105561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b50d992109ba09ff8e9104e91080abbbf9ccc1d9c7a80fb77b616642c91a540. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLHR52105562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07aff0e30074e6afb0e03d8a25367e65e42e88d9ea7fba379b2ddc5cb4e29840. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLHR52105563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc34338a293a78e93f7a7720af4df57943bcefead17835d51500d3cb198b566. 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/NLHR52105564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6e45e62aff7e34185d317abeaf078ab151f2d66371410bd4a89b26763f368d. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/NLHR52105565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b2e6f0d69dc25eb5fb3f10f6294a523373756d2d291caa14489e4a170a8b58. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLHR52105566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4719d48d57ecde4a609a7d596524422ce161d574663b7cb013a9712a7fb3dff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLHR52105567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x941f68e6afc8266e4001d736e61d7658bf2d718d8b6d9569c0b3c8c488b98ea9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USFI85700806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4584fd6799887c6c835cabbc323710c4084b8a3dabcda5abb4740f9293d2750. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USFI85600605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7dac5068a1b89346ce25dae1606bccc96d674eeec71b5fe221e3d8cf63de897. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USFI85600606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa963e9e99b082fde20521c3c727d9c1448c486cb127229830adf5602393eea3b. 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/USFI85600607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b1b39de6dcb36cca359103f2ff06a4d9cf7a306eceb795990f65212b5bca25. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USFI85600608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5c8f12a58b20706021660de9acac4b9bf8243d7fae1e5474dfd4b6a83a7568. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USFI85600609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57734db7bc6d2dde20ac9b55c3a85afc1e2f1bcc07013f4b04ff74a9c8d71a20. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USFI85600610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85614d5a52f8e3a5032d944344415e2cfac40becf6f3efb1ba538dc8c4012e92. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USFI85600611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ffe2169013b724b9794513fb92c972b461e2d5a274b7368b2313bde69fccda. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USFI85600612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985274f218aea8203da2291bf1ad50b13692c65198cddd38603574d22401e0de. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USFI85600613.
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