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 0x85057896cdf1e7463b00e803b33fcd292e9dbd17e8bc12d55c5c9aeb94280cb5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7e2f739f-78b1-401e-ba37-bdb9fc74d385.json and https://artists.proofprofile.net/proofs/artist/7e2f739f-78b1-401e-ba37-bdb9fc74d385.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 0x228b65f239e6c71369a6ffd8a4280b96b44dd30fb83f9ecaca017e3e7b08672b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZDA42106633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6a2dcfcac2d834ac4af836e1ce2ed6375bc6586b86fc81632147ada63cea3c. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZDA42185100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948de2047aa9816795de7b8089549854888b54c14a509fdffb01deb92cf7e335. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ESA012100251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f0e3fc38aa6ffa827a39b981713e8f850153d1b5049e39735a84f5eed46d1b. 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/QZK6K2172511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fbb551bcdd50bbe9b31da77b1c61495da36a39aad8d33e52ed6c1aa7d3862c3. 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/QZFYY2255239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb645ea77e7dde13596d677b844c0d7c9ee4fe9ad541475503401b8bb133ad2c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZNWV2236819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f61c4ffe6b4343376702242cf46fd5d3546af78e343663a9c8a89a283382e8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZTB92279579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4213fa61b9a801d1b2d60b9dde2055f19a52a33c4300b9a74ae0f8e8f4972a8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZNJW2451144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3e65f401444217b73f560a4ecb34802cd68b99823d358ccebb0a0eb5b038f0. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHN62519325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41bda870d174f218d3f3bfe97b60fd63b2cbc770d8135e4d910a2451b70892aa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZNWV2582272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326925b988e075c2e702dc43fd20dd4d5600e0952b5d1422be9a2491b357a5df. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZ5AB2112608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719a2b41f50bd2ffae2832cc93931233c903d8186f3b6b41462c9fb6f5428fa2. 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/QZGLS2397408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d902f51a086a03803047a637d30b044a924a5d025b25829200c03d3d876d2e. 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/FRX452167827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d902f51a086a03803047a637d30b044a924a5d025b25829200c03d3d876d2e. 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/FRX452167827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719a2b41f50bd2ffae2832cc93931233c903d8186f3b6b41462c9fb6f5428fa2. 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/QZGLS2397408.