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 0x41b9e49057249ef2a38f7544d6c6927fcd85e2ae5d790a94e436882d7dbe78af. 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/a72acaca-39c5-4829-a8b0-6dbb675db62a.json and https://artists.proofprofile.net/proofs/artist/a72acaca-39c5-4829-a8b0-6dbb675db62a.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 0x2f8b6c8cb93d942b9ee962fce12ce20cd08c898a669e14bbfa4592f8b356871d. 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/TCAFA2038147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed5eaaf004483a8fb1a56c2f5190ff1eaa80f450a5d498467a5716986031d3c6. 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/QZWDE2328310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8861d37cd3c713c7a3af2393910e2492858c94c54b23817603bcb3f199575f. 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/QZ2RN1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a256aad304190c269462f2e689fb7905e611f3154729c721c82580185ea7a54. 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/QZ2RN1600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a32c97146c55d1ba69ae254122c7a83148f35374ff120af10fc48740947ffe. 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/QZ2RN1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88b53f888e339515d708fcf95a70e22850301f878c892dae0992ef314913501. 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/QZ2RN1600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2828b3e91ff0b577979e1fedf12eb6433cbdee7dd48917143e53f47bf4ee40b. 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/QZ2RN1600021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1eb294bb5f90c6d909e5de14fe8eff7f71d64d2013df77494a4c8eb65326e86. 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/QZ2RN1600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa88b53f888e339515d708fcf95a70e22850301f878c892dae0992ef314913501. 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/QZ2RN1600018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8861d37cd3c713c7a3af2393910e2492858c94c54b23817603bcb3f199575f. 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/QZ2RN1600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a32c97146c55d1ba69ae254122c7a83148f35374ff120af10fc48740947ffe. 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/QZ2RN1600016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb3f7b8bc57ee7b3d15248064cc84c9054666e8d1fa6ef6ff578c55c16548f77. 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/QZ2RN1600015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a9b28fe3f6cad48d3faed0d4831b8865b6dd3d5c2bb4ca5ce37d579590a909. 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/QZ2RN1600012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb994b0615748ed1e5fab077e248f50a640d81c565da5566b9d19385cf99a93f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZ2RN1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846f65c8a15943f8d6d621e908700b55e7c51542fdaae57ea4a53a586e61127d. 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/USHM21587685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76fa06681a8b31f4b989029a2f64fdb18bfd74f21a957b7d1d0e8e70229eebd. 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/USCGJ1535058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e2b30d99a2f9276d44fc4840184c265437c0e68316fc2f12f654d3e01388da. 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/US92U1911044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c8065885c89dd813b2245dabf77ff52081c9106315768f0c9c58f76b2ee861a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T10:03:01Z), 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/US92U1911046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116ffbd80848b6368a77dba720c71244f0f1bed7a8912c667a36edbae0de2df3. 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/US92U1912141.