thumb|Cover of Vitellonis Thuringopoloni opticae libri decem (Ten Books of Optics by the Thuringo-Pole Witelo) Vitello (; ; – 1280/1314) was a Polish friar, scientist, theologian, natural philosopher
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 0x9f47d84166eb56c6bdf2e5e7aa501990274f2c9b43addb3b116d2397516fa8cc. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b88834e0-beeb-4a48-a0c8-97aefd4991d5.json and https://artists.proofprofile.net/proofs/artist/b88834e0-beeb-4a48-a0c8-97aefd4991d5.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 0x58703af3f51601cb6d9a23cb5b640dd7fdda904dbc4428bd11653e9a669b685a. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/BCVHV2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ea4b2b5f369d95d76a950933f44fa58c88bfc1f0f5c4d0344dc8e4f6faad469. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BKBP62400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93eee6904dbebf7419dc80c5a463bb63dbe6c0de411d76840e94a3b815b85848. 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/BKBP62400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02caff00f76534a66c136523ca24eda5b379c656730f7ef47d71cc6dc9433a27. 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/BKBP62400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6321d38bf3a629058a6a3d669b46c680e4f0ea9203a7fdd79f6823334dfd8742. 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/QZZ8A2417080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4b1da72bdf4d2b3725a66d02f02488d7cd8425d297be247673b78c730a0bee. 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/BKBP62400031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3c9b89ed1f89e3553a6ca1317b6adb3963b4b471e532e8cc55d2698659faeaa. 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/BKBP62400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca670a308b774120b3c2306aebd0e4be5b08737ddf76955e0f0ef3405db61fc9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BKBP62300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b2629815cc509d36daa8a002a8b12750144b735a3fd0b8ce8b254b8b6477d2. 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/BKBP62400035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bdce9d55d2279ee32cf79f2e57b9011b92abf85fe2b7192a7715251c74306fa. 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/BKBP62400036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a98c3a39b5ee7f3c632ea9e31be93b949e8c6fc4586b9d87c859246e4382310. 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/BKBP62400037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1fb6664d38caf11b221e4d706f0640195ccdbe101c1a95f87e627929f33e50. 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/BKBP62400039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0d661ab8ede46027c2db5b3237829291ed85cce83743ce1fe0eda845048037. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BKBP62400045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0332ca8954edce2901cfeb26c2f71d8bc64543307d0204c2294de67d464f83a9. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/BKBP62400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ebebcb2de5d31aac8960a86b83edea166d831b0f74176180ef2f44822deee8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BCVS22400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1de1f08ffaaf6bb0cfa7884b2da835efa01cf53782dfdd79ba36dbac1f221a. 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/BCVS22400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807a529969f65b049e2b666804739d6cab5e60b42b8d9c2f17bc3dfaf22d3419. 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/BCVS22400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867994e637530d29e348f5b4982fb14ab515a2985349cffdb4b4b03b493e6fff. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BCVS22400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3955120b2cfc772a06a40d42895a33f617273125ac888b093c0a5b7244199ae6. 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/BCVS22400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca9edcce0bf0ab54d840c4ac086f881452b9cdd434187bd94d789fae2133bf5. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/BCVS22400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d860bab65abe7cbc25708369c909f75b6b1ec6343c8d563f7568f2bef3685c. 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/BCVS22400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91c188491477c7a7004d206b99a73d105a591db7a3cdaf6765dfafa14866352. 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/BCVS22400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a12a186b64a769db52bffae56e78fc940ced00c82de820ec6e7418377621997. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/BCVS22400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ead0f5d6ce6106e8c4904b02b546c23a906b21c4840200056b721e28b6f9fc1. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/BCVS22400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf16d4078d5671c165dbb431ee5b99768ddce7b15431947cf8d9d777670f31110. 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/BCVS22400028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3536693dd952deb1381a206477f7a8f187c6a4e81596910ff0279d78fd37a518. 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/BCVS22400026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7c39f4f4865b495c5ba6af804f01fdde28d2d722522ce1d89b9c99aca3f75e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BCVS22400027.