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 0x7ffce14ec8c950f0830114484bbf77a1d39ee73d06ec4a2319c473fcfbfb90eb. 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/a3d2c5b8-5bf3-495e-8658-4d82124feded.json and https://artists.proofprofile.net/proofs/artist/a3d2c5b8-5bf3-495e-8658-4d82124feded.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 0x02ac7b41f73eabf5abaea95a1012c237d99862579812d42c9349abef91049bbb. 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/GXBDS2595895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c578ff37674c768a0cef80a13b8996f782c8a84a2ce730c26302b2611989c62. 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/DEWW42000265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c97ce8cd8177da857ed9a3733456a2c654ac733ad1548c7692d344a412c93c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEUM71709549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680abeafd43f4d591a83912dc3d619c508e25327d0a951f9eb0bd0372d2034b1. 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/QZFYX2053327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b9fd312b4432da96a9c3ee90eae3a622c33bf6ee212d2f1a7f7ddbe0e2c9fd. 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/NL1ZN2302400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x036d775804da49d46331bc385ad5df57d6055c923c2ef379b47f2b3abbf7c206. 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/CA5KR2332346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec686b86f65f2fdc2becfa9ad5fef2ef57b104acbd40156701a45d1b154f6906. 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/CA5KR2207237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec686b86f65f2fdc2becfa9ad5fef2ef57b104acbd40156701a45d1b154f6906. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CA5KR2207237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7924f10e8e6c7f6d54b09ebf9b2dfd193396c7ace7156325c155d0791a374105. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/CA5KR2118702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713d54c5aa7f9b93ae73854cd5092fdd2fd3ebc293f7f40da25e16574004223d. 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/CA5KR2108361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f6420e3a33195953b1d5b8cf7c61c17d2b9fbafa0555663fcdb1f10a76929c. 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/CA5KR2098268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x713d54c5aa7f9b93ae73854cd5092fdd2fd3ebc293f7f40da25e16574004223d. 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/CA5KR2108361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f6420e3a33195953b1d5b8cf7c61c17d2b9fbafa0555663fcdb1f10a76929c. 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/CA5KR2098268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ce776eb0a8bbf5e1acbd3e3dab3ae50825bad7e2d3808077342af2122fb41a. 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/ITDI32200032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4964c12d968f75a6c324d58a13fa18187eb65cd8de3dae0e434b7aa1aa562793. 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/SE3GO2312001.