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 0x173dfae2868b378cf120aa7746257bd70c4b5bdd13df6d0b22bc6a1815763396. 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/523e9273-3fee-44f2-a4b1-3d3a2802f0d7.json and https://artists.proofprofile.net/proofs/artist/523e9273-3fee-44f2-a4b1-3d3a2802f0d7.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 0x582efb71a3fac56d462f52485fe06b39f5a059b17b76eaf5e5c79f74d1a2df17. 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/DEGC61501398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3e4b49b94e845619084f6d9b8659ee6b2dfc9bec1619592f3e693679c2b46d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEGC61501399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x289a716d593bae6a4bb9326133cd3fbcbc6489f3a5abdae1705e596cb8ee5844. 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/DEGC61501400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87f88c9a74ba654917c626f6d20093ca209c9dd545fd50b2faaef70e97152d8b. 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/DEGC61501401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8b2c44472c0197b66d9fcb0eac81bafd00b4193148b8575f19dfd33fb73606. 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/DEGC61501402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a670a2cd48113d130f63420a1e3f03f55508b79ff6ce01906e17a066b94043. 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/DEGC61501403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856ad44da5b2b2e47e253fd44371c8420639047e8cce34280d178d3b8d3855f2. 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/DEGC61501404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12b1383a7645c8c82273d6723ef04d31a806e9e94e049b42f24ba811e784d89d. 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/DEGC61501406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79c79823a559b0b16529ac3ab087c10b0f334c061b170ba6e81d88ebadfc30e. 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/DEGC61501407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95be7d8daa78948cbcd7e7ee6b15f128fb15569c9df5f2881fa8ffb5169ec4fb. 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/DEGC61501408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbaa20b4d575c195858aec279f6a63057cd88e876128009feea3290a9676b84. 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/DEGC61501409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec5754e098e44a98270dd269c070cd45edfd556ae465cc71355285242d48a1ac. 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/DEGC61501410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044227f410d4c23de0ac9e949a46af7b6a41771fa0107c64552a6f7a0ae6c994. 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/DEGC61501411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b05f77bf9c8c8b376969f213d4e5394178524811038ef4f03943203447fc37b. 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/DEGC61501412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587950f0c3a5ed1bf0fff44c177c4a8f140d147660470dc5001fe59cd522230a. 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/DEQ022380230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587950f0c3a5ed1bf0fff44c177c4a8f140d147660470dc5001fe59cd522230a. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/DEQ022380230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587950f0c3a5ed1bf0fff44c177c4a8f140d147660470dc5001fe59cd522230a. 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/DEQ022380230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f107c5a2747500e4a26eef85700df4c44b2dc04bbff63a2850c667c163dc97f. 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/DEQ121753056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x514253519a8e205bcbbcb8f97206aa9d25c0a05ea44e5448e94bb2ee7bf4cfa5. 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/QMFME2307666.