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 0x271b3d21064f2e3ad7adaa49eceb279740c21fde911c08f08dc356306e97c3d7. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/522b9bb2-efcb-4ed9-a934-c39c77a00ddc.json and https://artists.proofprofile.net/proofs/artist/522b9bb2-efcb-4ed9-a934-c39c77a00ddc.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 0xe870c728f83eaee30830feb2dc31363b95489bb708980459a51a150b5de7f2d7. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/QZNWS2121858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e6fd0d3873e461a720d19d6efd67dd0031d04771678348491d35e55d9127ce. 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/QZNWW2108196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1c41784cc361a6e7e011a6dec0365bdc12991fecd0f618bccf0841c94c1ef1f. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZRP42140997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dfdb081e7d184be6b5d66593f2a279c05c9f2140130850b24216ec7a12a09c. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZRP42140998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5665bcbeca50baae7c23ee7d5ea147b2b473572378e5b5900cd97cf772c625f3. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZTAT2105734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1c5079890e49521d61537c397bb418b350be7cbee1e5a66a18269b0bc951ba. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZFZ22267581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818717dcd349cc445c58a94c14fadd716057a8174700e5d6f032c90a0af82f92. 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/QZES52242041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea5658d3cd21733d8560ee96cee19d1fa03385106a78375b6117d671eab74732. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHNB2296079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e9ea969389e5963f3155367faf2f47096e371e92f316a2d7daa43343eb77ca. 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/QZHNB2296080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329857994483c2c55ee5857ef6ca7e258be1875628c2e33f603a2a96b328948b. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZHNB2296081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75712198545db231dd18242b0357ca0e2d9f599d5f425f985bd95d236603c97f. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZHNB2296082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b23535e34265b96521c621bd984e7051ef4a7e9a4d2d4598dcdd393b8bdb3f. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/QZHNB2296083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdebc20ea66a6d8e3232a7bfc0869b60765b65601bf927c2be5b427f026e7923d. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/QZHNB2296084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f9253b8c7cc6020acb91afb0e2bf63e8ff860c1f7aff1e2372b7953459101a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHNB2296085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc199211f367e0fd3c278694f3310c1118ca014fbdffbc1221d6cfeed840fbff2. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHNB2296086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70333c592833b342e25ecd0d1b1923dff8599a737886ef0462d56068bb14542. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHNB2296087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae34c2c2f3f02d7b04033655113aa8e1a91171d8766cf5692cf900dc49c4ce1. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZHNB2296088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74849bc8132a7ce078519911d1badc203fd718e4278ff4a3e9b883cf9001bd09. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZMEM2255911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5b41deef4ffe33ff085d365ec132bf8f3d27afdcade36c6e24029c2b8f18a6. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZNWR2254788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578ddb9ce55a89a1379a4088f2ed2aaa3a7fa049a47692ad414383c81ca6b1bd. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZNWR2254789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920232dc31e2a015bd697741b45487601279e18940bc31c7f3e59c9ca717b5ce. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZNWW2255760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea169023864f88f3d9e453be9867e081db73e3287db4d1593411d08d0d1a5648. 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/QZTAT2251793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1536abe360d2dce8a2992868c4ca19da27fa95230bb37e71d79d79c9a20e8fbb. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZHN62314619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59787b37fd39d54ee9cf58076a3c97b196b89e953331c98f47160ec75a07bff0. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZTB92303235.