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 0xa8405a041a30ec6459c5eff4d010e1a64eb2261d9bc37dc3b4dedd3963c7c907. 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/6fe26fb2-3601-48a8-8650-fc18852a3bfe.json and https://artists.proofprofile.net/proofs/artist/6fe26fb2-3601-48a8-8650-fc18852a3bfe.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 0x742bc223a1dfe45b155c8c45638e4ea7ecf32fbbb61cbd1cabad08c02a8f294d. Chain 2 (Bitcoin): anchored in block 957842 (2026-07-13T10:08:30Z), 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/SEYOK1111052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b6392e8394b6975d1646173ca31fc59ab88c9829ac355c8a519656c775eaba. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SEYOK1111054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477dcc61e426f4d683d85f0bd7ba6f04ab8a80a285026133cee3212c4f52be9f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEYOK1111060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xced508337c892a88e741e09487f2cba490f46974fa62a45786de94614f1d0f1a. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/SEYOK1423581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf47d428b6332b174406ba6c8791ec70546f286144eb6aa2ee086e44a2e23405. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/SEYOK1423582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68c42d10f0531248006e21be78800734e7edf37cb60fdf91f08e9f4aee6f752. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T16:21:50Z), 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/SEYOK1423585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0dcfbdc41907f3879916b66712b5adcb3fb93908fb1beedbdac111ff30f5695. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/SEYOK1423592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa710db296ff7f84e33752f1ccccb26bf2e355b61889a6fccb33da0936fa489. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SEYOK1523012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c796b068bcfb6c207a1bdbede673a4a3f005573f91007c1cc88492eac09dfd9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/SEYOK1630113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320f7aaddd6b9078c007067fa3fd118ceb933159be9433f0cc328969edc367af. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/SEYOK1806340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe91c2f75746c8c8d59f96f97f3cc2994526bdf6ee93423f86d41489c74aa72b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/SEYOK1854451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87c659495330c58f2c6c44ea40874dfffcb7fe6866a9e159b2a03f8c02c9b133. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/SEYOK1854452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2361fcd74250593f766f8bb68076e4bfcc567fe07753eb4a347fe31a9c0df9e7. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/SEYOK1854456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d8cc6f1ef621811b7315e08b4c3485b44159be4f39bcf2a9c81b20a3ae508b. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZHNB1976586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a7fd83f89b67ee10ab5e51290a7438abff639c7d8b96d11566149fcd184a40. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZNWQ2144603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79aa7cdcf2a13882dcb91bab0cc6815adab6c9b68da6cbe46f8346bab6d5b00e. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFZ62493034.