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 0x5e026c061f954661bf0e6cf7102ecc42370401e3458fc0989c6ea76167312ba5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/836dbe73-db4a-4934-b6da-7c29e8a880a7.json and https://artists.proofprofile.net/proofs/artist/836dbe73-db4a-4934-b6da-7c29e8a880a7.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 0x8d67f76f0660465434e891d1127f18dab6b85bb3493880a184825fd243171b82. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BCE7P2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8adb47f311a4873c3e3d1f9809fd1d04fa7db8a7a0c352bd006c9a71c9c9170. 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/BCE7P2400336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1e38545b8f332b983a08d3ad4bcd5c7c94c5ca10340970fe39b955fc7de873. 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/BCE7P2400339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5970f63350a3725d924c3a12ef11ccf4d2616ce6045fa6cd198b181d1beca5f2. 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/BXIV82312133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31aa355c5ffc100cf2056992ed7f252b7b9aff6a4efd1c9ffcd7ded4b821f8e1. 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/BXIV82383018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdb4adb520aa0ed489e6b073c2214394a1b0da29afa985fdcf4116c2b91ca90. 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/BXIV82310770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860d4375c1ebbb8b9bf23f2589f013fe504408d99636dda7db52c4dec22145f0. 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/BXIV82264070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79114b6244febb201268b6bfbc67d4bacbebcc7deb7bcb076c7b38421c94b4e0. 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/QZW9K2337899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b2bcc98ba45570e6fac5642bdd3c833b9f98552c5b1bcc23a1e19de9e4ccb97. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QZW9K2337900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0057e9cdca82eb1716ca02075cdfccc3ade9181a825ae15c12422b724482d02. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZW9K2337901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25ffd3f66a5ef5f902adb9d89210ab6423b0cda4e884950f164a7ee687e61795. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QZW9K2337902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46145f199955ce09dc4b50c4b904f96b848e32327f4396f142c85c78cebd891. 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/QZW9K2337904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ebcbe187b9788774037c9d77730e1360136ded8f7bb0792a385bfba884a1bb. 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/QZW9K2337907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2094ad89843ee5207dccd1ef7dbf9b6edd050e59d3a82128e8a89f8f4690e9f4. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZW9K2337908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5786688ed09012cda4a6425859e7a38c13d1ae17857516da805ea6cd40dabedb. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BXIV82325616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbd81f704ccf2c6c4347be4a8fa02ac60a4b9850659a853a6a2563a30cd53e97. 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/BXIV82363025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb3460c458ca80894f99f06ae3c89f86d03359d3be4960e16b3084858b17897c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BXIV82326128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x059b6e45a643686e4accdcdbff000148e3981a27d3b3eec03d7ae7680b9c108f. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GXBAV2498710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d0d9e0e5aeda1fb2b28902d49f71f33f4f51016f579d631bf306cf186e455b. 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/BKF3I2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27255fa857761c66691d95e83c56454ccc2c0e44af517957cfb1b6b8ee798880. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/BXIV82329540.