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 0x56a1a0e4eaf138c9a778603170180d620838625c7c45b293944845ab708e2440. 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/f2cf49f3-5238-4633-9fdb-9df843409c19.json and https://artists.proofprofile.net/proofs/artist/f2cf49f3-5238-4633-9fdb-9df843409c19.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 0xc684bc5e8ae37de54230b64ec8d2a6890d3e3c0a27efaad7074edaf85724fdc9. 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/BX4IU2311944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5a74bbd62bcd73cc862b450335aa6a823b623b15e43148e2eeda41abd6f278. 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/QZTPX2382330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0159b05846f8e62d657baac1f8c408e9bd60948fb8adaa5404e4c7d8c9666cf. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/SGW502497476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9432e7df73c7d5cebd46e2b03a9c115e1ee2e4082e46bf528ba15b4fd51b7df. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/AEA3A2253448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01167bee0bab069034e99aaaccdaa91eff780738dedfb48cc4178c61b0496cab. 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/BKTKU2400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e428a178b5fafb5270dd0f3c5d4dd0d995b9c2a92f48657153ae3ec3c81b80. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BC66P2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe855b5d4ee3021211d85f5e07a3976ac5cef231e79747e4f18273b850989dcf9. 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/BXKG22400796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c8d88a85c570745c4b995fd3ee8dff36ebb70e0e5f6ccf79d079b698b1fb2b. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/SGW502497225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad1fa4f5388e873dd6de990530cce537d8f58d179bd90c42fc00565d784db7f7. 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/US3DF2450082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c0b81c9d0fad5775548f555eeff51cb45a056870d862419f1a5cbcd92fece3. 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/US3DF2441780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a0f1f5466c26ae2c17f85adba4eec0a44925d6b5b929ae667ea864d462ba53. 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/QZGLM2525077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9d2226473362dce4fa4c87c885a90d76f02323c940413417a4091b6b790a04. 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/SGW502356155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfae5f75fa3420dce145451c9ecf785decafbd3b1ebd825ec224aaaeca8643ee. 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/QZNJV2399365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5385d05f7f9f850eea2eb91f4a01b846e5a3bab4aea3cfea9288c5e881075cd5. 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/BKSAI2400158.