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 0x74c22f00c402f69490f9f3ffa36f3d82e757b2966b29ae937d71b29b338f97cc. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/64613ee2-d47d-4063-a768-ee0b20dacc7a.json and https://artists.proofprofile.net/proofs/artist/64613ee2-d47d-4063-a768-ee0b20dacc7a.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 0x011b8292581165e808b7a835bb75aa5299ba0507e3decec04d00fb4ccb26200c. 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/HKG731725791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8708feaecccd8607875f66f56efe290287527400070a03c089051d4ac51d04c7. 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/HKG731725792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fadf0ea2b239181092ed1d649d9b872eefcd3ce030015c3164d6c0d8085a11e. 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/HKG731725793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c6d4f6ec292aa3f60238a83d34fe279b1b45076f2def5e61fde7c1ab7b0cfa. 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/HKG731725794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cb8da7325dbb191017c33dd0cfbb0ea11acb73e04b5903cb264a36212353ee. 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/HKG731725795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01fdaeded63c708cb3dd3d8b8ac2ff350693ea6940832d914c03d845ab29a26b. 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/HKG731725796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fcbd697081361a9af55501db30541ed98729becb1381b5307d6bfed392822a. 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/HKG731725797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da754d43161874012242a1e8029a30379ed52b7f3a69d20599cf1d935ff743f. 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/HKG731725798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd197b960e53ff543208d610e81cbfa21ca4351123f47914b6730b571ab60e54d. 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/HKG731725799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361c53d48974763ec9873d30a0dec4319dc199421620196ab49b4b1f322c6c8f. 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/HKG731725800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0036f2f1c598ec8377d052365f7a28b16dfc6be71c78a06d26d98a7f01e6557f. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/HKE672401408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72901f793d9108574a487586a750750adb0748727e7e6334a49231d5c89d4d52. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKE672401409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34973043c175434859433052243abb58dc890f8d0247b6c9a61ef5923cc76a7. 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/HKG732352271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7f8e8d42bd52c7e13f8df954e103051360cede4bdc7a0137e0569f1a4d7c48. 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/HKD012301150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36231f1f9944916696f1116bf47993eb2f533428d63fbd7a8d080a37fde1639c. 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/HKD012301151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872bab54066115bcd95840871e459f344a0a84ca34f2df835cc101044b7a1df3. 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/HKD012311323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc48b960ecb6275a58810635ef46df8a2c815bee55636407fc8bf7ab204bad47. 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/HKD012301153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2246be4405e400b1ecb09fb3fe3ac31bec4729feebf5105993322c2c026153b1. 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/HKD012301152.