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 0x949fa14f774e29a233dbc16c05e5fcb822440de226a561dd75d7ca42c6441d84. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f1e03d6-6f0b-4de5-a0f2-bee5942cf461.json and https://artists.proofprofile.net/proofs/artist/6f1e03d6-6f0b-4de5-a0f2-bee5942cf461.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 0x8c7a0b7dcbac065bc5480308a5e71e81606d53440cd120fce06ed0adc4281b81. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZES72318018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9dfabf58c612bc444dd48dcbb476aa6433c4d3505ec52fc32e923ce8c962702. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZES72318019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb5982ebca303c1d8d474090a6e088b146636a72af5c7d14e4a73f13038f750. 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/QZES72318022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd01216e807811ae866b1e45dd924f90233c6602997bef4ecb6b9ca151e3e67. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZHNC2421943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b97fda940c60e0322ccf44b9fa25c73121c5d7376c62ed2b198a4f433567050. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZPLS2543519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3975e4441307940d80f7e4c506c38cb8fbd4e8ad90c477eb7b611837d25ec1. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZPLS2543520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7157262ab3f741c78f9002a13eda612be3555879013acb93e9ee86926436c5. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZPLS2543521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fda3e12aed3444d6903282d19594e0060de245fb1d0ebe0e9d71596166e6eb2. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZPLS2543522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef486a54f024b0cf56b0e2520bf9cb60bf8d432b6d3e919ef09d5bdf5cc8354. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZPLS2543523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b0cca4d77e0d12b79ea56622c7e2fa3cfbb5978e6bfcc60d6ad09e47101b0b. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZPLS2543524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7975dbdec539e204901847831ecd8ffd08bdc0b32e249d7750d089aaf5e358f0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZPLS2543525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaaec684625472bc7b6027d2e6cacec685f27a3dbbdbb492d40a4de38bf66ad. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZPLS2543526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0193fa9c85ccc861881f0c1c756173ee52b02b80c066e7ba156558ec08b57f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZPLS2543527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b29c5e6f8db1c449e4a52ea8eeae819d8e1bcc1cf8e6491b556edb8faea5cda. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZPLS2543528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5abf9c5fd80da6643d152cf77cb57f2bde1a4ee6789df8f691e5e9fb2531476. 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/QZWFR2520014.