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 0x804d6440bee97b67ea3d7491e75d7737ba47405555dfd8b797bbd9fd33f473f2. 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/78a75d23-fe8d-4030-afd2-7f1be493eddd.json and https://artists.proofprofile.net/proofs/artist/78a75d23-fe8d-4030-afd2-7f1be493eddd.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 0x68240899899f12e207ee4bd40588c7e3e785456a30ba5b99b7716f5f4671b56b. 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/QZES71987550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f2427dedaa2395690f875fc15b9dd9f3837f859547219f2ad8bee468f72dda. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZES71987551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b1bacafe57020ec08c6f158eb5d9bdc93e1320341da3a56ffc84bf518d2a262. 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/QZES71987552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd109066fd1fb0148c9597859a646af2326b762c870fcf8a5238537585ddf8820. 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/QZES71987553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea05ad3d2c59892219e9022429f47f44ed7fb2a21d9c88e0a50e21a468422f0. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QZES71987554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c8a300ea36d91a34059eebb10072fee9b13ef33d07738faeae80eff1508ec4. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZES71987555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83553a4c96df5bb3499174034368767687566badd03cf43ac2399cc4fcb29eb. 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/QZCE61889041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52a797e3bd3d9c94c5f50724604070960dc9879822b5067e4a09dfdd7fbe4a2. 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/QZK6N2269169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8cb399519dcd37b606551c7de6a4249a70103aced7fb5d095aec25cfc04a491. 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/QZK6N2269170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c075f42b9f24efa854a8527655a8335ec5be4153c76788c4177ae416eeaac0. 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/QZK6N2269171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f3f78c369fbdcdac4b888e52b0a02c2ca11944c1d2c705b58efb3aee6c9458. 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/QZK6N2269174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b691b69f800ab95fab26669c9218c091db2e29ba4e8a31fa055821ae8ead27f. 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/QZK6N2269176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a87999da3176fbfaadf5438600a74404a5f4a9077ae17ede72f28603865432. 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/USCGH1917239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197a8f24c4194b22da4849eb61960c053e302f6bb1d57f89347958d6861e6abb. 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/USCGH1917240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b2614866bd95306c0253e87edaee23b5a5482b9254082d66610a3b7c3baf4b. 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/USCGH1917241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73795480f5c71f84102df1d970b9c60a942533e308cf437325567d163b91285. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USCGH1917242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f2427dedaa2395690f875fc15b9dd9f3837f859547219f2ad8bee468f72dda. 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/QZES71987551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c8a300ea36d91a34059eebb10072fee9b13ef33d07738faeae80eff1508ec4. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZES71987555.