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 0x823c857a1d48f2f7f9394668548cc94433e645dd9dd1dab910937d6b190f4e2c. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78b4667c-9377-418b-96dc-d84cd3905b26.json and https://artists.proofprofile.net/proofs/artist/78b4667c-9377-418b-96dc-d84cd3905b26.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 0xa0d2c0afc910c3f6c1e58ecd24af40224ffac7a94b75021becef12ebd22e895a. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QMJYX2193001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39bd87221b8ca76de4857c3dc390e3ce263d9e232accc4a11a108f40f1e0723. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QMJYX2193002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c3ca5632c90969b9409b73595768432d979507b4595ab0f295a6ddfd0dff49. 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/QMJYX2193003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d97029a49ac1e511b2378c221e2870645dc9835b1f4177c273264506ad4521b. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMJYX2193004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d95d7c23d9b5319f8acee08871a7f730751ee7b8ec393be0386ab8479f9b14. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QMJYX2193005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66f650e9e8d23b5dc60b0abe5787dfa40b3d273bea1364d88a7b7099bd55a8c0. 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/QMJYX2193006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9e4cb8f473ba4b47602af628076a47a6b876e7d8d1bade52f178196d9f42e44. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QMJYX2193007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64f59323c9706d1328478c5e0dff3af5781164367ff7fb14b0d7af2d63dc32cb. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QMJYX2193008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df3dc2f172508a27ee6a6e851ce8053a31b13736bcf43f114ed4b23558ba82b. 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/QMJYX2193009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ae999f054ea608f4c827671bda92ead80e83dbe63ef697d9c3d31697b2c7f4. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QMJYX2192901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a01b1216b5047913e41bca24a27c92b93b7ae263d8ca123c887fe647ba42ea2. 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/QMJYX2192902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645d03f15c7975a61bfe88dd2d6255abef730b50cbeec6f4efb416d2911dc1f1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QMJYX2192903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1b89919d1499b4b785b32e0d0c203115534296625c91c8ba689c342e576a5c. 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/QMJYX2192904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc686c56a40b3492034f3ae53b2ed70b057acfa61001c91ec8c5fbc464387a9a. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QMJYX2192905.