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 0x67d3567456b2721267e7e55a7b6ecea96249af30e403932e5cfeb13b9b99dfe6. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10cdd24e-0eb8-4eaa-9f4c-b07f56cbe55e.json and https://artists.proofprofile.net/proofs/artist/10cdd24e-0eb8-4eaa-9f4c-b07f56cbe55e.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 0x24c5c47637dbaf78829859ca4c1bd48d7c0c178adba88f060c82a2566e6985ab. 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/IEUM72300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf646ce51d1fd55f7f9b0980d9e9e7f2c145b87f2d4a2b872422979c384f404ca. 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/IEUM72300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4ac28fb1bffe0f0127d450fa8f826b0074d293f3ec40dd3cebb3eb1563629f6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/IEUM72300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf873f03113a7a9162979fe85a2815bf8ecad67697f9a10928881b33d88bbd40. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:39:47Z), 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/IEUM72300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61992324258f5b8b4cf6c151851e00b49f27765b0dcc282ebdd8ebc89dc025ee. 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/IEUM72300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73b37b04d5b2415448a5b470a38f875153f67d423c10bc884f27da6d87c1094a. 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/IEUM72300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddeb8f3aa22228c7e12696953eb325b36a3c50594fecbf094658e887af283f01. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/IEUM72400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d01d881a1a0bbd9d32ede31fc5bf9719f57c9486470e3261e53a41c2c0fcae8. 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/QZNWQ2533395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd4c4674f502d23f58cf152cddfd8c2fb8e779519791292d1f3c46cf7ccc5eed. 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/QZZ7W2445002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538de1a3d3df36660eb8289fe963d34c6efe5d4b325afeb93e98673ebd88d763. 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/QZNWQ2533396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6d11d08b5730764d45984c4effd422041919ff6712ae3c4c4188b288e4c0c4. 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/QZDA72546041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0789712f3bdcbb5127fa2cc88f95f6459ad78fe824d4c34323e9dac549c52bff. 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/QZNWQ2533397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d32cd321f984ad560a48fcc158c5ff8aa17e7bc36a459763627d78a97d8e758. 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/QZMEP2540892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf184d7a4b5f2406fb9ef857848464942cf1e0ff4db73c89e22c558c697e939. 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/QZNWQ2533398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686b11bb026288c0090acd7786bfcd9485022ef85b686697bc853b4f74c4b6b7. 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/QZNWQ2533399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b2e7ea8a0b06abc5dcc1d4ac2eea67f4f027d0603c7660d5f15a0111f6a1c45. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6H2599464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a6383696eb12898f8e39dcf6bfad875fabb4e9b0ac479fe2d9a86b7cc1f7c4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZNWQ2533400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d39239fe950e735a0d82435642ca68f4bc6c90f92a6a5f4f5a2bd8f769cd23f. 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/QZRP42541232.