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 0x13d2211745c7bc9b672208ac7d2796a1dd841dc65faa9ed0b8c36cd2b26445ad. 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/7c33186d-8252-4c22-a138-63ed56171cc3.json and https://artists.proofprofile.net/proofs/artist/7c33186d-8252-4c22-a138-63ed56171cc3.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 0x67f0ee3ed15527b25831f9a19e86552d1d6d2b40ac73e20052cb45b2950aa596. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QMANG2204444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6e5fe1095d5b9c53883ec1f0d29c488db93cde7f1faac9668887f4416a2bfb. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/US3DF2402074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fb9c9a922476f731145960245bb7ce663c6e36706284273b7b52218c8eff2d. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:43:11Z), 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/US3DF2415767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607eb21b4740c22034ed3e4e0bc1755875dac684ea04b5ccf7d9976fa6922e80. 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/US3DF2415766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34e4e9a94f4434a64d11d576b68e69ee83451f09b95c12d27d68145e2ef6f055. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US3DF2440662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x090483319b95bc5382b02d2c198d2e9b6daf9eb37f905e3dbf8210a7866021e5. 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/US3DF2440663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x880a1b03c747cbe883b1d26ced59a3c9af14cb7762b80f819a0f4359640eb606. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US3DF2450926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc726864b04ca0bf8a752fac5d7ab1eab73bede872f89b81f12053ea7b0fa02. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US3DF2477850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c66e8b28f20980694a40beaf17f5063c2a52788d3f953513d2cf047d8cc9ca. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USANG2403518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973148a2f7b381c49a65e75fc6bac37b699e0f63503848abfc97d6dd36cc5515. 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/USANG2441279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebdf677ff9c2cea9799d94819d2d34ef9f8328173e8649ef111b502e012e69e4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZQAY2572030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6715d68721ddb210a45b4f4c49f8e7ebe56a491b1388767eae3db1341b747950. 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/QZTLA2506457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef05beab2c6ee1174fb6d400d71839d190761cf6d279edc4f10c3a2bbfde7b7. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T02:41:52Z), 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/QZTLA2568036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4253ef504c6f4c79b68c5efdded2240d2fc479545a38bfb45b712c589e91cf0d. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZS7J2557730.