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 0x8a1826d20dae88f81792c3d8363097f6796c79fec41ae94d9e5d2e918f3172f3. 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/3ff2aa74-0c8d-4fbf-8f65-8fa843d9dd40.json and https://artists.proofprofile.net/proofs/artist/3ff2aa74-0c8d-4fbf-8f65-8fa843d9dd40.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 0x4dbaa214fea346a8576b50d213e3ddc116742016278a864c31afa4f2b1759da4. 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/FR59R2086889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bfaa1770d38ad38c208b471342dd883b359f0fd32f77bfedf395bdc998456b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:18:38Z), 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/FR59R2086890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09dc4dfb226c2d82b71768e8b528fdf988b5b2ca8122fed1f0794d684ff8ebc4. 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/FR59R2086891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a4b944591f5106474e11469b32ccded65059ef2babe988e635db4a5ab59b51b. 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/FR59R2086895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef88197cde047f7847cd7f15641730becd62c0624c2d84050599af46768d4f0. 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/FR59R2086899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2fbf879aad15222bfbb68fc73359b7bbb09d5c22988aa32a1acfba9d65f8276. 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/QZDA61914619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ef170de4441f7d90bb3efe4b5ec7161710c2e6fb2b11b7b3bd2223af3f34eb. 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/FRX202364273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32041fc9bb7d40820e100c640f2091997fbd834017cd86cd41f5da2c3e2193ce. 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/TCADX1805341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfae59ca0a250cccbc560ffc8273df32ee86e52bc21057c59c9630d96008e599. 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/TCAED1987172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4316ededb8d71473d440647a13c4493838e714142f553dd9cebd42f5428d834d. 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/CA5KR2215278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5368c30652f962e44df406a9a221b98c62a1413e1374ddab9cfe22aa2febf24. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FRX202060705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78e3b2038a830099fa60caf62964e2ee364c631760a8b4c23b52cae38751477. 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/TCAFA2025812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033a7090eb7d9d055704e896b6444e32ffe46eae116faf710dadef7f4830dc4f. 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/CA5KR0008200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf481ba087c5421aa3df7a2e97a7ebb97025a4df5dea85bed1942d21ff68d020. 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/QZK6P2149580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b364ac458a3f9ed316a3ed07999eeedab93d5ce8a535fb2d2bd5896f17dde61. 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/FR59R2460859.