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 0x92d14eec404c414b4482f123589bc798ddbe213702830318b7f69861f7f19009. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/321b06fe-283a-4dd5-bb17-39d008f52f85.json and https://artists.proofprofile.net/proofs/artist/321b06fe-283a-4dd5-bb17-39d008f52f85.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 0x3150900e4121c9f349d35bc9c1694fea4f4bea7719ba592142f7827bc43f4e28. 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/QZFZ22172669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe536a86288c1bea5b405e9711065b7d7045eb46633cb770a34354ba9ea214f63. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZFYZ2440994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2377e1c7957d5019e3b326924a54c3b29e88aea1c1f8144063aceda8e2a16d. 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/QZES92447569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333f3251ab73901ac17dd05323064900059de7fc508ec5e7ccb725be7685f33f. 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/QZK6M2418730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec2ef6403484dc564cbc8a6c897f14abb2c6de0413f1fbe695d3165f208ca12. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZMEN2477714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81e4359d36bf5ab14d5332748f0d56ff721e01c7963e58d887f1ce67b85fce8. 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/QZNWS2413075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4e205fb753adde3cab0a3ec363963b90f05bc2561b7f3049af7512f2912741. 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/GX5MX2414535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2769996079863d62ac9e7f73363faf73d65e2a50dafe0997840b40d4050aaa6a. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/GX5MX2446993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab1c0f00d84abc2751469cc46aba254f278225d7dbbadddc689e10db1208b4a8. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/GXBDS2417789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bbe7851212f1f2e01ab303efbb518a7b8007e195267b936adc8995699dd3bc. 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/GX5MX2405307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd45c3f996286d2af08c9aaed6c6f99debbd2b6f7b314b9513629b2890f15a02. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/GX5MY2468270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cb963a1efbc3e068629b2b2f91101b375ef5148c86b98678be64a14fb0826f. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/GXESV2486082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x353d951deab31998195ca44294a60063eb6d20560ec215a86fe14792c0f3709c. Chain 2 (Bitcoin): anchored in block 957965 (2026-07-14T07:07:52Z), 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/GX89G2463534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12daa07349c8d9b72871bd5c9721224c8eb74a62e9475a1a3a255ae467383ef. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/GX8KD2565435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939e4e98272874b894733bf24c7739b18ddb6948b63670268950ecc04da63635. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), 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/GX8KD2582420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2cf8f82325020e2dc8b968905392a3da5e1fd4c8febec8769cc960c5fee744. 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/GX38U2581036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd350e7e3c4a6bf8c327691e702587e518677a472346a74a9356ce92e7f6b1ea. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GX38U2569930.