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 0x15b82edc28409e9218a0aee9f330dc805e45d40378580f9a786dfbeeacaa7a8e. 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/5ae7d243-0a2c-42a6-9772-a4bde14d7ad0.json and https://artists.proofprofile.net/proofs/artist/5ae7d243-0a2c-42a6-9772-a4bde14d7ad0.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 0x56b8f028c753b9323f4eec4efea790adbf88871a402649ceb2e1b0c22fa4aeea. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CH6542201541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0281980cb92a7a6031dbb41d55d36123041ba376a9c3c0f04bb50e350d9a439d. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/CH6542208946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9f0067cd42370e528f77e8544c2bdd8b7a6149ecee3b5933663896c9fd29e0. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T16:15:11Z), 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/CH6542280062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc75a5a2c550d68949d550f44ee37dd850222ea06e7161cc6ab556ec242cb1a. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/CH6542280064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7ce306ae88775f0a1f63607e604d4787b0bb5a8244656ed1bf6d48c7aa987d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CH6542226857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb47b25138d8858ce71ee0032932b69696797a6378c6b481b3c2c07ad5104f5d. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/CH6542280061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f68e92ede2186dc76e4f2a55ed25e524b01b17ee86b2b4749c726871f69cca. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/CH6542280063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa0ca248076ebefdfa739dbdd87e91833af42ac4510e77d8c20b00e50c465c2. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CH6542307294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442d1a0a35060f52c6bd6e9773004511fce1268cdebfade59f612ac7dd91b775. 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/QZTPX2321073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1004803f6243854be58410adfb0af5459d0c0e1244c7d398ce2c3d58867aa3e. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US7VG2465604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x322dd8ffca6eecbbf46f6d0389c3d3854950ce36144703fc370494acbcf4070d. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZGLS2404967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b5eb25dc15df219f33845ec6304d78d883aec2e00b21ffb132c8cd6fd031e7a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTVM2464894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7268475384a4431680470142b170066432759d2d37fb4c0ad609ffb3f98a97c. 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/QZW9L2458939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19734911f9338308eb1e7d07e3a9fd3f95e3cce0718e492069e87d96559bb000. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZNJV2561727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfdb86e9328e8f72807f9508457e5dc6a466556ee2c1b04d43eed745477ac064. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZNJV2561728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a5ddddfd853caabdefd70288bc885dc71e60a16d8033f05c179ff6abf7c116. 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/QZGLM2391650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019565c69e018e52739378f90b905c27c61efae9f1a779d30ede4a60b44b6554. 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/SE6SA2359017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb72c5a18be7afdc0e5475a7f46d031afe4538bb21c9e9edd882cee88f615976. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZTPX2407528.