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 0x72a48bcaadd5df69c07fa6d25035c144be5627b1227ea09a57c4f7981683110e. 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/f2f0cef9-936d-4a6e-a345-689896b00902.json and https://artists.proofprofile.net/proofs/artist/f2f0cef9-936d-4a6e-a345-689896b00902.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 0xbcc9c03ce01c60b32632f6caed268298bd99c13addbe9b48ed72b996177def77. 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/QZES91945733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4ce5d2578386bff718f37b7bc33f382e1c232cffbddf739745860a272f0c11. 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/QZES91945735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a7b93a91b563f26d836a6b5ca66b870a749cd4de37c4bfa88b41e4c92a7d91. 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/QZHN31914011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61645560f4ae1538b8b692b6f11dc72ba0ac9180251d01632d56f72de8ef3a52. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZHN31914013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68f4f462e50f48a1dd958012c1c9e40c504f538c7d51827c7ab76182924c5c9. 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/QZHN62006013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644bcfb5522a8095096ffe03e8fa86c7f58bb024410e9f52cb1bce3abd46c091. 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/QZK6Q2053118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1d2927c2e49da44bde60a1c41a56ad48bcda995c59b147e879500ce5c96eac. 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/QZMEN2016664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d377a5469393df264d190ca0d57bf3b20c46564d811b28d8e99e5bb74072673. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZMEN2016666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b294617b641b454a181e87a134ce127e7bcdd5477c878a0ff3252185163af6c. 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/QZDA62175383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x850a1cfb39969393c32449db5825c5c9d99d2a4e9408aa52272ea2ab1fc98f74. 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/QZHN92103894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad37fbf134d260d994ddc3fcef2db0149ad3aae5792e71bb988827d612cf266. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZHN92103896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebaeca2bd370346c369b635a52701f65474ba04c2ec62a9928dcb35d8bd09ef. 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/QZPLR2177697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d40b5e88722ded4e946113764a5d6ff9d40ac62150c51b813b4d1a124f01b88. 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/QZPLR2177699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2985c399e7b2436127906c636c85630bc393bdfed2ba48eb59dcb65f5ceffd. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZPLR2177700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd41f320c3b6b6f6720cd8d16d35ce6b5e51b9e5a56bec296cea954ac4eb9d1c. 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/QZPLR2177701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08e7c6a693634c76c0cac36e3c63bcead96cb609cb3793b9fc3adf72058da353. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZPLR2177702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3502be7d015051aa26e66aa85160e38df56c160fa7e7211a61cc7b658ce36c63. 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/QZES52267820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0569cd6c04a4f9899f50328ea266c005a11d19ca72b01a834bd3d2ae96145488. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZES52267821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84f381d2505b208649dbacc5ee24cfd6abd70fa1a93fa7099f1f21ae64d2bd8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGI2267176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a937205affa3f991ae98cd530882c4e3469bb499fbf5d8ba0cbc45b9118ed96. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZNWU2264734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe64e8ef85fcdb0f95f44914026dd7df2580db9f29b6e7f1673daf114e546c5cb. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZNWU2264735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308f43c33f82e10494517175988b743be0bc13099a79d366946bfcea76473d65. 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/QZNWU2264736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9216ec7cca1310738a87bfa7095306b04c284367fe73a99c9328f96eaa00e9d. 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/QZNWU2264737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf8f740483eb7d6d768bd86248ad595a89dc563aebc24c924bd4bbf4d990537e. 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/QZFZ62378922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475d61b77025091061db141244bf57ec67d4810ad05bd816b6029c7c9ea47fe9. 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/QZTAZ2371003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa1d51d883f832cf0cb1e52f414a1cfafacc0af7f5b4691565a85a805edf35c2. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZK6L2473239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6c09a3dfe2483aabe36a444d563f8797102e70abd70699f5e51b7305d2579f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZK6L2473240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9436c57699643653dd4d856f6e483ef511d1e5c176aaa0a8c8a8e463868f182f. Chain 2 (Bitcoin): anchored in block 958322 (2026-07-16T20:44:14Z), 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/QZK6L2473241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069a11562490e0828451fa3aa3c0aaea385b77a34adcd00e56c0e8b592e7dfda. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6L2473242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30935b95a7a8c9c8b19763875251acafc10ae7260b46965daf7acf99d2def475. 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/QZK6L2473243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fce759a72819684ec9be9869f521caa2f77192964494712733bc73b34b7f8bd. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZDA82142847.