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 0x3c7ddf80ef7263099541eb8ea0dc78e1172afd2ebd7ab75e116ce0bbbee0fd37. 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/d78e460a-e625-46b8-8d25-8c987b6affee.json and https://artists.proofprofile.net/proofs/artist/d78e460a-e625-46b8-8d25-8c987b6affee.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 0xbc26e632d4c8f59ebd3f64ca715573decdc7f7a11bf3c4bc96373e8b1f6cc80b. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QM6DC1547495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5f5d56e553961ba7fdfa12035979bc2f55d4ff5d39d612fa4962b6b0c901b6. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6DC1547498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832469a749c80b96edb74e9a2c7ff71e664f2f371a6a018e74603937e8ee5613. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QM6DC1547499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc26e632d4c8f59ebd3f64ca715573decdc7f7a11bf3c4bc96373e8b1f6cc80b. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QM6DC1547495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde155dcf22a9826bf0d9b896edc7d886b0674a9f0932dd6d7ba31679b2ae3a2e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QM6DC1548138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982d79225591caab779bc5816e2259eeb3f50e9824941ee4a3ab88e606fe8113. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM6DC1548139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62b40d6dbef8d36530abf766010e84410801b664711ad72903458b196048911b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QM6DC1548145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b38cb8a144492024059928d08d3be964271fea586dc76a72a54177313d7c81. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QM6DC1548148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8dca50e678e87bc17e8dd3ebb04a3f0981605c71bd531f2041db952733b7e6. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/QM6DC1548152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d82902c8a88f39bafb2f85ee1dad33fc1448e2a5a012673278ac8aceb293312. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QM6DC1549892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e127d32768f7ca53e533bae363b463a28542e9fa6887302711a27fb0abc83d1. 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/QM6DC1549895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8311ba7d4d1f4bb163df16bdfddfea0b548b1a0af0ed225c994cfba3bebdcf0c. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QM6DC1549880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a28b0c65947919617892d9082cbc87a1d4dce0ccb6a334cf890cae439d7b7. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QM6DC1549881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8311ba7d4d1f4bb163df16bdfddfea0b548b1a0af0ed225c994cfba3bebdcf0c. Chain 2 (Bitcoin): anchored in block 957697 (2026-07-12T11:22:18Z), 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/QM6DC1549880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37a28b0c65947919617892d9082cbc87a1d4dce0ccb6a334cf890cae439d7b7. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM6DC1549881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ec0c3714506185eb1e6f3e0b236c1ad7116eaf6f2f48b0515bfbd129a5ec67. 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/QM6DC1694311.