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 0x287d4b940ea525d10dc2dd3ed68e0166240b389012dbd80a164c990eb92c078f. 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/77808db2-42ae-445a-b8e5-fc8c4854cd48.json and https://artists.proofprofile.net/proofs/artist/77808db2-42ae-445a-b8e5-fc8c4854cd48.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 0x8b67497505f12747e4ef47fad219ef15ef804143e4b84d35d969141452dba706. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/SE6XW2148359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2b64ff93934e6329562c01b5ad9d0e840930e3b5d4f1123160e8f1d11dcc9b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE6XW2148358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb275ac6b46f25c405afd24d8d38136defd78132a6e32230a74bac807807f48a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SE6XW2148357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0428ed4cbaca94025f8230b0d5948342222ffe017d3f0625e1f4ea1d06340c9e. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/SE6XW2148360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e71b7ab103829794384525b6f7a818318f545a22cecddd1ac0dcdffcf2d5691. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/SE6XW2148362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce1272fbd63d66771079a29d781ea1a75c60f332aa32f3e36abfe9949a3318b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6XW2148363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce45f8fa81db195891f48e34cbb88755687dc847b460442c5af394229911482e. 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/SE6XW2148365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e874a58a6ec061aa56c8b2eb01a68e703cb6b320dd1b4091ebc054570e1b365. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SE6XY2336261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237118095a904d37c1151a005d728bed0f5b0a98b6a6e334d76f0e954f4f366d. 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/SE6XY2262704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b75b3c632d7b63bf5c9511329fca1b6bb442731434a80833f962be6f30cf547. 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/SE6TI2343323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b81dc05221026608d40e1bacc43752fd310499bb4ae033b67af928367732d4. 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/SE6TI2351967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0903f8abfd710c0eb8119778eeccbd989ff59f4e20561f34c9f87356c1e05c6a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/SE6SA2354327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811d80df32866c9bfb69715073c32c5377296f94864084a8220117dcb15bffbd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/SE6TI2395434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634ac924d28774633a9db22f6b514a0f15b07464f92ad41a651b6fe757b2aec8. 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/SE6XW2309775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda07dc0dac91e133e66f534e30d1ba7253eeb0215c9671600d2c4deb26b1d0f1. 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/SE6TI2322139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13219b6ee7f89be9fa5e904e5e7394c02a6c49a83c36eec58a4164ad7989c4dc. 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/BK4DA2453948.