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 0x79fa084698ea5f8c83805e20db006a2c2f945c2a1022b50d9b097f0287d337f8. 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/923b6e38-ac43-4126-898f-2ad73abdaf87.json and https://artists.proofprofile.net/proofs/artist/923b6e38-ac43-4126-898f-2ad73abdaf87.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x53841aaca14c4a7d4c7eb6d283b5d2b66a24b95bc78fefd0294776bc8f39c065. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/TCJPM2052229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x865ba392042f1d25beb823ec922ae40e1014d0640bf2e6b3b58d294a7938b544. Chain 2 (Bitcoin): anchored in block 957616 (2026-07-11T21:52:36Z), 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/TCJPM2052273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920b7a13351ab01e39db6abf618601486819ad7129e6a7509ac72a3f93e29e4e. 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/TCJPM2055169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cfbc44aecfec4641e7601efc2b3b355e2194956f9d24d2dd3f0ba65fd464fc8. 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/TCJPM2051152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3347e6a0536c5315bd66e59599c2bd823eabf58a2969d6c765561f34a7c23cf. 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/TCJPM2051512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb630734f371621a6d8d8309aeb9e7d28105fa368b206a389874d48267187e00d. 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/TCJPM2055122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a936020e94aaec4614ae0558ee9188d9354e42683d57e641a8a50eace13215. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCJPM2051570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef5910cbfdd2177581fb24ca8e37657e2024b94b7d14486973b6ade5d90f0c7. 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/TCJPM2055125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f5579ea338edcb46c55831a356fdf95017bfe55dd2a45fc8cdf5e9aa0f3bf4. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/TCJPM2052265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6654166d142c3d8ce0738d524eb9b2a5e0560a3b38e49e5deaae3b1ceb9dc2. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCJPM2055124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375c73ea9c62acc94fb73b8d80712f8a79ac2331b32bfeb76c503c6815ab1f8e. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCJPM2055128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d6c7cd2d5571e14afc56b21ec21dc7b9051fc95c23ba871d0512358bd756f4. 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/TCJPM2052226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1555a03d49cabb81090b22f0f97b49822139286373ba94fb4b4f0e59c8320fde. 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/TCJPM2055121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4ac3311338051b51c87cd5a1377108f2a1836b53e2d74218eb46b5ffe9e443. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCJPM2055120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9cc1ebc29112ee9761e16371b8a95da42327d480dd52cb2ad37e7c9ce98e21b. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/TCJPM2055130.