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 0xcd4e7cb3f6d26a444fe19beeb50859ccfe80f0117af9781d9cdfd17b5428ae6c. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0124df8d-3281-4334-8cd4-fe53904af7a9.json and https://artists.proofprofile.net/proofs/artist/0124df8d-3281-4334-8cd4-fe53904af7a9.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 0xf578219e1d7b0d9f51530f4e9e5cb985616c0fa77418cd98f74556630296c7f5. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZW9K2316073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4523e9714b344b544b51128fb1482dff12e0aeeec33ba2f984304aa49e5e1d. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZW9K2316074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0898dcde13ab3e660e5280612023787b13e686953321f7bb17b76e1bd2986e68. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZW9K2316075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66312e40e33ff8e614ea9cb880ee26c73182e373e2f377e59f2c89463ee1c782. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZW9K2316076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e68be4ba84d3143903c39ec35153e8219cec654a625088815fd96e45364a757. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZW9K2316077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea66f633cc4d40f9ef41dc1031b450d6c9eb1c4e7f936595845a5f2bbee9561. 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/QZW9K2316079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b29c7fa93bd481768a583e2b48d13dcadc49ec51ccd8038e0090f84035c63d7. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZW9K2316080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c6304f8b509ba3da725841572ebc8eb2433831fe18984d3501bd13a859604a3. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZW9K2316081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbab65355e6a48bb9a884805a20892a7d752ed6450a250276acd7e631edb70397. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZW9K2316082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5a1573b46c509ed52e226e965bebf50b21ecf7ee271a0d36fe36598de9e627. Chain 2 (Bitcoin): anchored in block 958667 (2026-07-19T05:04:54Z), 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/QZW9K2316062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40be26cab324660decd1f3342a57b7cf28d7329f3edd63219102668efb642c89. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZW9K2316063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66e81d4d4aa5f3b438dbbb13d01b335492b13ce4750bba6e7e308fe06740b03. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QZW9K2316064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d92b3dac5cdf50c5a00f48daa7f0995ec599b6d364638163390476b00673a0c. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZW9K2316065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca46ddb61d50792d7b3523d53b107c2cf56fc6e94a1eccc9b46d67f580e52e91. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZW9K2316066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebbe20922001857d7438e8a165ec60165ca1433ef61e8da8205ee4e67c02edf. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/QZW9K2316067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422bf5c7c0977f6fc9eea77ac0843fd8f19646dd7bb5d45678eb2bc57e91f0cd. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZW9K2316070.