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 0x8cc22a03836ecc15f88ff6cd483aa3fb88e108f4a48547d919085f05ca727639. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/376c2d91-2264-4f86-a741-4e1b25469883.json and https://artists.proofprofile.net/proofs/artist/376c2d91-2264-4f86-a741-4e1b25469883.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 0x60a339f7885507de4d9fe6d88f8bbcbbd504e1693fd632eda8173830c11ddd36. 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/USZV41600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b100727250640dfce2cc25bba9b294d42b304371f781433dfedef6d70630e09. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USZV41600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c02ec12a0931a8e666fca31c445e314e577fc57438b02430246b9e3925e9ff. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USZV41600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff012f0b3e41fc0f7582be8e966973300aae024038a6a048cc8e0449bf899745. 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/USZV41600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd345ddc5d3ebaeb6d31b693b2053fefe35ae3298e083f36459e0123e9f43b464. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USZV41600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d194a5653710a7d4ba0c1b39820d2fef5558314ba7f7b5d18dd30e980efe348. 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/USZV41600008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d26a98337d0ae7a8ffc3eaecd2648bc5446a196281c04b88e38c0265c06dd9. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USZV41600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec9a71977aa5f19aa2a4c71c389a31d3c9db8b6a5cebe23b732629b8cb64977. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USZV41400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d948cf75d6554d9d967a0a0311227ee2fb41158382866151c501db386eba48. 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/USZV41400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8a5b44fceb774294e84e93a21e81ef8bf865f674570c7ec0779d47795ef9ab. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USZV41400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8d33fd99875a8004e6a80f3f867e24db2cdea3f8bc6a655e3b6528839e7f509. 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/USZV41400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51164a13920b6334b244b35ef957c419857bb41649644b10203edf136520acf. 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/USZV41400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5263d5ec2f33caabd3f3287d7b96e52f1872f82561d95935263e9e97552235. 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/USZV41400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaace60e0f6638d5654eae770ed2b2dae935207c12ad1729ef7f0b62698642297. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USZV41400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c832625c8c982997f16b8fdc6021147fc32cbc0db761de6b4aeeb01c65f5c3a. 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/USZV41400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00543c3032dd9def7693f8ba622cc344a84626d0d3b5c627d1491989b3006463. 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/USZV41400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6868e3747b07c1def24a59aee62570af126fe6c898f8eb9fa4036702be92ea78. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USZV42400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8eaf4bdc5fe1ecae5e0a0b4239adbf2e0397ff07eaf3909dccf701256be0f1c. 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/USZV41500002.