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 0x4b6b7f3c09595c0b4f508434669a07c2d02f4ea51a0759383eaa6d79c6f264eb. 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/1c66e451-e62f-4860-857f-9b31de076008.json and https://artists.proofprofile.net/proofs/artist/1c66e451-e62f-4860-857f-9b31de076008.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 0xdcfdc4228ee28a581c3dfb71a0fa3742b94090602ac63041f485bb8c26357f2f. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/ITZV22200098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1a5a9675cd25c20b4f1d2087d0b3ebdc2f0d878f359da196989cf93cbc72925. Chain 2 (Bitcoin): anchored in block 957834 (2026-07-13T09:42:16Z), 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/ITZV22300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcb7e1c4d59dfecac0f9b147ee0d5cc1ebaa7221e00857af67ee226fa805d174. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:11:42Z), 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/ITZV22300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c1bd488c510b3d50299ec0cc0f5e5ae4634deedba7058b6189ed0b19923e52. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITZV22100012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c402c3b126c5cdf0e58a8c807e7ea687ae50b7097945add0f064b5d9f8e296f. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:19:47Z), 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/ITZV22100072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d95f0dd5daedca4d6f04c86825648d94ba6689dd9a26dc301169eccb559207f. 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/ITZV22000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1892dfb257a83f40c3c2c656c31cec0a753b02506d106ebd7149fc6f4fb41d. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITZV22300017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c52d4e077b5c0451b3d7cd6ac5c1a75533a51774905c19c1cec6386c7454717. 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/ITZV22400090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d1599c343ada93b5bcd254898e79cc7aadf3e43ad50c5c7612f96391758c36. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/ITZV22500023.