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 0xb1716c3b18b1cb874dc21d8486aad9760b57075aa6c2bcbc4b211866e0c9e00d. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb60328b-d257-4c77-a278-2a25ae4d5b3b.json and https://artists.proofprofile.net/proofs/artist/fb60328b-d257-4c77-a278-2a25ae4d5b3b.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 0x3ac134817200011b93db844d289f86051cdf396771000e30a40990f019798b72. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/QZPJ32323769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bd3c3614145be4b7cf719dc706713b62a0ae58a4d3cf9b24f42232d19160d2. 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/QZPJ32319210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x564d9a18c18e5a9d15da87892a383f226be250c960ee9b77637759d5e3dd8e8d. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZPJ32323770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd759eda1e9b51bd4184744b190174cd2298842b6a1590d2669b1f089668cb4ce. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZPJ32323771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d03248a8cc6ef2111f07cfdc0ce9026d7c7c54b8abd9dd8a2fdff3ba96b0c9f. 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/QZPJ32323772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dff204bb0d9b7bb5186bc633d2565b95fbed9d667e30b70b82e5f886bf9aa25. 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/QZPJ32317714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x873c4d18aba1359dc96b7a97530a9124b06c27e2303fb3e68db21cd8d52ac62c. 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/QZPJ32319612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a614112edd6216976a7d905cecc1ec59ce764d323a425e8bb7993cce7eeb144. 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/QZPJ32330559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb28053ce0869f43f1afb99c2087712de2ac3cda07d3244ef16abab760fdc06f2. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZPJ32331416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4e8db082de8182945bf9f761dc1189207eae0b4e23f12426854897e9ec4ce4. 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/QZPJ32331417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e0f98f63e13ccf46bca33a6aa17aa55aa098965a6f91f1d031ca07bfc58be9f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZPJ32331420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358df1032e8f049c3a14bd5b10e83612821841b3685aa91672e74f3a5a7daf37. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZPJ32331421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cae7cfe6026b7a25f6ced5ce51168959ed72b9604df6887e01c0afcfe321b6b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZPJ32334433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cd3a819ed2aa041175eb846e321b39e1b9effda29f539d99dec8acfa6e4759. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZPJ32344039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94d762088c7a777b0022182cd2bf0be1198a6eb5a26746562eedff3c1ddbdc4. 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/QZPJ32344041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd44bce301fba5a24cc49962f19da00b7707bfd9af481a49c9b8246c2debf02b3. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZPJ32344042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea68dcba80c5404fbccdd3361ee40f4d6d7e15a10cb30eedd1f8af388c10ca8. Chain 2 (Bitcoin): anchored in block 957012 (2026-07-07T08:27:05Z), 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/QZPJ32344044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82880f2ac7cf92dae3bde1cf06389bfebd298946c48dac49093a88210b6960b7. 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/QZPJ32361342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dff204bb0d9b7bb5186bc633d2565b95fbed9d667e30b70b82e5f886bf9aa25. 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/QZPJ32317714.