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 0xe840b6d7fc215960f7b951b9de5b6fe9186fcb6d64ba790e84ea4c01ec0cd7fc. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7272a2ba-2866-4c1d-8093-2c04bb8f08c4.json and https://artists.proofprofile.net/proofs/artist/7272a2ba-2866-4c1d-8093-2c04bb8f08c4.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 0x59dd16eace8556feb39bcac0ba72cc85e7be03e78a5619b55223c2e23a597b0f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZ5FN2298326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbf67ef25487ace35aa2836be2b2ae8c923cc15b7d8143828d393a0aef3b39e. 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/QM4TW2432258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5c99d60b832b514807de5816aaa40ab7a4d00c0fe096b8ae3ab38fed9bf338. 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/GBRKQ2108617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08143ab549aa376d2619ee63f636a03f31c1250b0e994ef9b7d756be6836f03a. 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/QZ5FN2264468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc75fad49f4e3da7809d38fceb5e53e57a91c9aaad476e34d48f2a9915036ee2. 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/QZ5FN2264469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc18eda3ebe241d7c8bf615125d23ec0b54ff0b10385429aa469a4eb06f0cfe. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZ5FN2264471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x726527b4b33ccbd7f886ef706d0a5c1c1519b4060eb9ea8dd6136e43c8c6d245. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZ5FN2264472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50192fb22cd16d3a1a6f14619f1079c63da09257a13d22b19c6429b725a8597b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZ5FN2264474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349134b18eabd74c0a582d5364b0103826e2f4a8e87682d84c4f9d7922c0f6f8. 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/QZ5FN2264475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc73dae09bc54d9ce76cff20ffd540855acdfcd9313bd07a3220f7322733b6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ5FN2264476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6ce4fe81d75551946d2fa9d2efa8b0367b98ea39abc305a20336c9109e50b1. 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/QZ5FN2264477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b86dfa05e85277ed11b1134d950665c994dfa5e237bbefce40ae15db67538c9. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZ5FN2264483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb263289102f79cca2a63e548eb30483cfcf449573ef8510af5a19f057e7c505. 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/QZ5FN2264484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16de8d0f4d31b467e2782e8eaf684172b991bfe1b2fe0060ddc21943570cb6d. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZ5FN2264489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2edd2ad6fbb39b6df7f4b98237b0d803f801700c261c664a1c48438d98ad24d. 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/QZ5FN2264503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccec0e39e9c38342e61c64c4bfa410456b5b3e56af0b418d2b432511e03a6a6. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/QZ5FN2264504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9af46afed54d23810e6c30ec9a60c1f82e441b46b64b57ce015dc0d620ce289a. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZ5FN2264508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad20fba6de9b13730e417f1f4a5984d1a961916ae12e43232fd0268ac67c9af0. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZ5FN2264511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09f67da8c40856260276b88af1cfa97d17cd0caf476ef8fa58e6caf7eb4d2968. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZ5FN2264515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d8c8fc807c02f2c1b88c914d2c4fef4980f0fb086622ba26f8ec5c991c8a84. 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/QMDA72321177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877f9fc2b44be968f3f8954084b09a4a4d0b260d0c58f68253114bccc99afea3. 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/QMDA72321178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf81538019258a84baa3be85276513bf6ac2d722385e5c0a5ab18b28fd47e11ed. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBRKQ2169273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695f34164cfb74c0e47f58bf411331bfba0894c3fb96857b178e9719c6c58d0d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB6MZ1700272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151a117ec3916d259b714c4380d118120220033f8034ab3f4139a26a637f022e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBWUL2257038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec8b0d8e1e2ea6690014ce9f17622310a02444650463cb792a359e4a89bc94c. 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/QZ5FN2201425.