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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b25c2fce11441f2944ee3a9175408bdc6bb6510134990d8cbb38c7da0584fca. 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/71459e6f-822c-4687-a01b-29460232ffb4.json and https://artists.proofprofile.net/proofs/artist/71459e6f-822c-4687-a01b-29460232ffb4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69aac3b7dd185720ec9551bfa0038f310304d7670c406d9bc83976e4ebb6b534. 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/NOX8G2400130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f67c46a58ca219fcf5251ade5f501cca3e051d9f52c24879e8c832df720f0f. 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/NOX8G2400131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac093f819b1437b089fc3bf113d0b1d567b2106fb06c9797ab7760c3b3f73b1. 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/NOX8G2400132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7aa1613e71dab3fbd3387a5178c57592958ec5b5637df8e20b42c9acb7b5a90. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NOX8G2400133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaed7f70eab66dc71c7de15f0facf57d802986a7c60d2fa44e2f445bf722a6ee0. 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/NOX8G2400134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c42c34559556226cff01befcebd95a38e459f3db2080e368c1fd5c1959fe1a6. 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/NOX8G2400135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3275693c17ee3be85971a0c468838f1383e14127faa6bf87d5d748a1e945e7e4. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NOX8G2400136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21cce2c2506280e9fa840b705880fb06d688b160310ae7d2b68f334171de0eb. 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/NOX8G2301890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3004a765069ce9fd473937983f5e88a12e197511787c203dd5d281d0c96bbeaf. 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/NOX8G2301900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf0c89924095360b576f74b12fb59bc0ff2c204dc4edceca8fdb8b0591787fd. 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/NOX8G2301910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b9f296de3dd96d599892195dac485a464c96a298beebb873aceed1cf4fc555. 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/NOX8G2301920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28206b9746cb0fad94f1ee1c19f14029a5dd6ca8d807a6d7da45cff224802d6. 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/NOX8G2301930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97261ae267b617a5f51bfc64392d2f83982668ad42f3bd1bbe336c78d7f03c94. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NOX8G2301880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635921e176ffa9685229debd995ce416c6a3da012083d9e184c8b3b4e8d7d721. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NOX8G2301940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa662227108f0d5e9e4b09ab0a95b4641b1d516b2b42a65a1486f78896f79f137. 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/NOX8G2301950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd10c87aacf098fe6482d6bba8f97f503b0a839c769e3331070658627c94ee67. 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/NOX8G2302005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7a0b4e9a980eee8216d7839f54917e08f50d8b869798b3a22af83a5e1d90193. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/NOX8G2301960.
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