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 0xead411acb72fbd478268860c537d8014afb494ef31d03ea2d90870034f5f8a58. 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/dcd0a4b8-79f5-4d1e-9177-6b56e712a8a0.json and https://artists.proofprofile.net/proofs/artist/dcd0a4b8-79f5-4d1e-9177-6b56e712a8a0.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 0xb70b9912d467b1a33d82754aecc474d87d2b610390b87d580ef0629bc05c8ce7. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZDA51814224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6647c75226ec647da4aafc3fd2629cded473cdb198aaf9677ff89a8e5e5e5a05. 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/QM4TX1739048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6cda02dd8c1325642d3937c80a9f2827304a5a8721c42dffa1d43be6b4fab0f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QM4TX1739049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85a3ac85e976494dddeacd9c7207ed45e224fcfddf3d66c93ee0fd48bb92584. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QM4TX1739051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bd7a41ec1d57e33db8da349d9cf7562da6cd8065be048fbcf012c91cae9898. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZDA51822096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a7a6df0d073142dfd9df986c3939bf280c8320924767afad8945c345eac571b. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZDA51822098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdf1a5d53fc17f7c31079837ce99dfebbe0fa3cd57b8ee939484aa2f842fcdd. Chain 2 (Bitcoin): anchored in block 957629 (2026-07-11T23:44:46Z), 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/QZDA51822104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02edeae3ed589622fa2a956f8dd9f4c0cb4e88fe20fa997f4fe4793c7d04e166. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZDA51822105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3474d28c34aa065c9aa83663789870703c3570009f7385bc6622285557983cb0. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZDA51823179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcacaad9d7c7522a3284c748465a69f0524fd6c3390eadbb9e80005209a2767fc. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZDA51823181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ba2d8580a8c5df97bdb19ba24e56638298f7e561bd8c54d9a98b3cd5ca525f. 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/QZDA51823184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310e57e5232604d19a4eaa0513efe345930904b7e01a793483f77f48d3990a0e. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QM6P41986942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x895f17d71973fa5b5bf67db685c91ba5446aeaaece1d41be62e03a93ab8192a7. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZDA51825453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbd8a69bea10090e1c57de0a330bebe048bd50d20020901056ea697c95a7752. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZDA51825868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7b443925f8e9ac240fae5391de71285c63a6382ec5f35164a75635ebf0b799. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA51825878.