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 0x18339cfc9afebf92f1b22ad62ef73d1293eee91dcdfecb7a9560088128a02ebf. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25fad38d-7cfc-47e7-a487-38eacc9bc758.json and https://artists.proofprofile.net/proofs/artist/25fad38d-7cfc-47e7-a487-38eacc9bc758.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 0x72c17d82396f21f51f78b1ff0d843b2093d302f0b303220d492548a95812ac22. 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/QZNWT2015389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d8c31ccb6a02c10d485a2354d13b27eace80030da94a26b5748ad90bba07f59. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZDA72060069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4096d65e2463e6b3cea1799e6145266f4ba6101d6407f1152e0535002413c1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZDA72060070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9c4982a6ef14803aececedd2009707929f91cb96b882cd79efb73ef1ef6244. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZDA72060071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0dd48d1581e75d9113564e416c860d460bea98a3a0cbb77289b8d8ec8646b7. 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/QZDA72060072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x762d10c7001d7ac036726f9a450c81c3ea446e746354d61cbae4a31d3d83d554. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZDA72060073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8001e18cc4f2b1997325a0bf861e05e55e0eff016c3b0a4f83c0b66fe67a7725. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/QZDA72060074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb657159c8b5f94e1badcbb6b022e670c69ad407883d419fd59b4c61e82895a6. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZDA72060075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4828af57129dc637eaba0224335608f53ca60820034c6b4fbbdee676e31e6b93. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZTAS2431777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5c5da674718483eeb056a07dc7f31eba68bd781936b44185802bde7fa5db26. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTAS2431778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5575cbb7e42a4d9fec92e9c71e911ec42d73001d7a322d487de048b7ac312fa9. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZTAS2431779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6257c7d4a286cfc159c1adee50c7cf101132ebb641cc4ce748ade4a53797a7. 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/QZFZ42432211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ebe78fd0268bbae87ebfc6cf028412fc759066329d0c67d0e3c535c1b5bfc5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZTAS2431780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6257c7d4a286cfc159c1adee50c7cf101132ebb641cc4ce748ade4a53797a7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZFZ42432211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x696a0d657f518de3579f8b17a89511ac109156ad36487a12172b90adf1451770. 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/QZNWZ2204264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46f97a0431a18c5e95d5d2f8c5ca0c02565811ecd69f6b163de4a60c26e6863e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZK6K2024863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x521f36c7abdc53f280d3c8f7bd59ce47d5dde0243bc7e17d1c1f16c0c5210e86. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZK6K2024864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2164789b4cdea1d55e3d172d8d16517337ffdd21980b1b0db3e9c27f429247e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6K2024865.