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 0x7508df023b36f1e6dbb5c1e41e11cc82179ba403e854447b8c0a909281fc698a. 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/bda8ee5d-a4ff-4bb6-aa1a-4affd6cd339c.json and https://artists.proofprofile.net/proofs/artist/bda8ee5d-a4ff-4bb6-aa1a-4affd6cd339c.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 0x72f66fb04390b8cc975e7159e7b83a7038bd47408f9edaf2ecd6da59a59c7fa2. 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/QZK6F2261923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c028c94571d6daf8e7d20885c2a3f4cce7b2bd8f5ebeb166347ce07fc5ced4. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTAX2451473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb92c4c7bf2de99d2011df0361f216287bb8499ad9357d35ef32880e4133e970. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZTAX2451474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fbe4466cd140461fa735d0c0df672ae4a474ba74773a5e089b8512c670a662. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZDA42341556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d62d0e5c020b0c99fe60667cebe8524edad68f1a89a64276fb26bcfd8c0c21. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZWFF2363507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01a054c80f3453c0ca260e6640a1aa963a5499000ca283514cea000bd2b3dd85. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZWFF2363504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x729eaf418bfbddfaf66d3b46ee68abdeae57b68943add59c3d40cc5d5c9e840c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFF2363505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a237d5cd6b2306b4f082ba8bb3566fb992cc3bf603fa753b639e1916b780cdf. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZWFF2363508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ce3b46205e9d86d8f311de2d5f512f175bb43976853349a8ddac48deb8cafb. 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/QZWFF2363510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x787911cb2027cbc30b16880f6329763a3ea829da01ff4a5e42096f50983820ad. 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/QZWFF2363511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a7d52cd94872727f7570a4a0c350a88eda71d0b0b622f395d1012e060294e10. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6G2454322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd0d5dcaca8010bd4f11cfd00b3c1108bcebb9cff065a4a8973b902c3a11563c. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZK6G2454323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09e27b556e58b721b7d5a04fd1ce9d16748516fb79e350686f7cfeff0f2ca01d. 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/QZWFW2448578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc945365f0304ab0f834b4674b221141e5b7db9f76575bdb48aba88e49db76a9. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/QZWFW2448579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f56570abe3f8f1f7e9db979a52f59a440d44b6ab0af7310a231abd5e4b4fd74. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZWFW2448580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ebbe9f8ae3935c3b65f469fadf9a0440d26f17e5132eea3bbc235bb1fecb276. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZWFW2448581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11d5bdb6acd3d24540751f6086ad143b202daed431f443538a0a87f71efd787. 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/QZWFW2448582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3605393185f24a9e784c444421b97d0b534577d245ef01ad5b6fe8c018456cfd. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZWFW2448583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13b0130d4e6190b572d10a528c87a73ade89b884d09ab13687e4619c66ae0e9b. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QZTB52502741.