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 0x1f7ceaf9ff3038d029704c5c546aa3e0927428576b85419ba403de6a1b41a9b0. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4979ab36-cb44-4a1c-84c6-fdc817a87f73.json and https://artists.proofprofile.net/proofs/artist/4979ab36-cb44-4a1c-84c6-fdc817a87f73.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 0x66d54682e31cae8cfbdc8d460e6d8aa55307336b572644fdb695bae86fb07598. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZNB82002941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e59b2d765209c04da951ef58295860a6b1826b04fe02ab188b15b5b3b6926f. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZNN22158188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf12076a91951b69ca30720c3011516b92ff23b3d796a66ff2d9c1086caaa564. 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/QZNMV2175733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d430222679078786385d2e05423741215d65e60d658b7e62b4542eb0605689. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZF8N2150123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x717d8b4f0c2f9ae9584869215e34785dcaaae0854618c0bd3de6da54343154da. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/AUMEV2212801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b4c98a90dbdaa49125612539b8388e12dda218c19c74b8fe6583d0b01eb534. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/AUMEV2223615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc84e21341ffdaafa5f55f0ef0295a9b3bcd40629145feec061f357f1702d0b. 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/USUYG1371118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf156b6430767b26172bc936d1f1cae3797edcac844c866dbdc2d858c7201fd8f. 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/USUYG1398401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb955b3e6f1639a0fcb7c24636315724ea925d30454557c2f6998a7595aa79735. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/USUYG1368447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf110d4dd4f3155436f01b02a16d71c5c49c026602336ad37187098f0a1350b. 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/USUYG1388740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff63b38984f57394293fc83fd86f63b3c29f933b87fd5c64a78f794f4f17e14f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNMU2260149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d53bd274b0fc296d2b012b0f3762e0737abd91340ea1be93a11dd6fd4fd3cd. 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/QZN882345571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d0d3d43ad8eaf514e2c9d689a33051821fe7965b3033b6cdaf472c461f57bd. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/QZN882398174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842785cdbb34138b1a54297bcf90fb065a0a9451222064776b0047a77b6486ca. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZWDW2346194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ef0ccfc93df50ac43afdbe5fc02ffea2ea9bda91ed455967a4029a196ce221. 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/QZS7J2384198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ad39ca730a94c742d27a4dc2ab6b5509f494b2473e09e38217b2f40e8912c1. 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/QZTLA2458622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d04e0ad3c7e32fe4f6c02c28aeac62f26223802c986eeb1d717073fe540eea. 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/QZS7J2511472.