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 0x5cf1e4f3bf70e7b22f163786b263c58e2f59dc386b7debbd28ffca1d1e52bd98. 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/42ac3e80-9491-41ac-afd0-ae6d7986dbf6.json and https://artists.proofprofile.net/proofs/artist/42ac3e80-9491-41ac-afd0-ae6d7986dbf6.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 0x837ed65408ca00cbd3c849a924796fdfa1a2e51a5efaa3dcaccd07936405bcd5. 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/CZA232201117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1314cf7827532e2f980c76ceb113f76a5109b8855cbd1e9bc30d718ffd662598. 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/CZUM71900354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579cb351955827c97e49e8e502e4a1b089a45e2eb38d042afa02d1b3333a9eee. 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/CZUM71900313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c056754f1f306c8e1e7e9b71a7f1f9cb87da56fcea7b5111af6355a5ed28e71. 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/CZUM71900355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d954407dd849d8438423907f58b8692c4a1760caaae0feba046617e81b5edc. 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/CZUM71900357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad611fafbf12192051320bce1bb904ab8d41c4e0a008c375d080270ba9386d0c. 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/CZUM71900358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8800498a1a1f9f1036bb75fb93483e1607c1e0d31f22d1252b5caf3cf69bf6. 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/CZUM71900359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaedb7785607ab5a511f0151cbfb7d97880c6deaedf266694838b418897950928. 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/CZUM71900360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8de20ddb0f49d387ec711e7b70e80c270faf74548fa00beecfb523b75111157. 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/CZUM71900361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e345500d29193f708448ee9ed506698e51aabffa4a26663474a6f36cdddea58. 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/CZUM71900362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a893ba0b1e48a65cf243e1fc738e1fb4fad56dc04c5b36605f77f0a2c7e4412. 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/CZUM71900363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575f582966dec616e7042882341241cf7965c08fdb76f2b167c0d653cf05bd95. 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/CZUM71900364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5695beedc126fb39d08108da419382bc94500212572abcba76232e4d837a14ea. 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/CZUM71900365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x026f6259c2c81a02c21353e1c60571b475b20536beb2da035a9203a7d91ba6ac. 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/CZUM71900366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9373a239724caeae5ef15570ae58ea1a1004631072e9da6bf6b16aea0b6b9b3f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CZUM71900367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18e9a4fa8c986fd224a3ba70ee5d0752274a16a71dca255639cb429ecf5148cd. 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/CZUM71900368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0128058d76ef20439c166da79f41db3887bac58043388c5e5f743a938d8887. 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/CZUM71900369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b20b7d60bd0f96af9bd7a6827341391223349cbe48409bf872fcc3b0dcd61be. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/CZUM71900370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddfb83b6828a08ca94aa64e3467e97cce3c32eaf20dac12f8980c1ff1cc3888. 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/CZUM71800085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc0aa4d3831bf768f207aeb638497704df99ec35d35b55ba1a5f4b90e6d5401. 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/TCADP1871845.