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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 0x0d85a074765526a9403bd7d1a1e9292c4b5a194b6196218865bdfebf6d9067f8. 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/1874d84a-3ee5-4694-ad6f-0b5e2ecb9940.json and https://artists.proofprofile.net/proofs/artist/1874d84a-3ee5-4694-ad6f-0b5e2ecb9940.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 0x370ce20446ca9246e5f744852e3351cb816463ecf94f9db4b9e81d96c2c1e480. 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/USME32101129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3763a4b5f5f69bdc316f78c7b2496527a54aff214b21b41e430c57503517249. 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/USME32101130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c70b69b5c65a80dab41bbcbf8db68bc86a6bb8eb6d2614b93a32b7ea9e6dce. 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/USME32100158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8faf6ce1e62b2269ac43059f4525579c7c925922e45f91f28e05c747d03a1a4d. 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/USME32101132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be8c05e416b7f59ecb0ef825009b0ec68b6df54a55c6c05616f7483420f53e0. 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/USME32101133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65f97c3934a86fdf19904991ca4bdfe2cfb0199790a6309e77650742033472a2. 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/USME32101134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47067d8f4aee48034af95d34d475a9df2342691b333232a107806543ee56f4a. 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/USME32101135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465f4ee17582b7c1e5bfbb551cc797e373a3804c99f2203897d4b22d72a06b73. 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/USME32101136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6495ec2fd31c81a07df22f43a72e0a0362451a301f1586e9f81a51bcd9e15b. 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/USME32101137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477ba478832ef1aecee2840409a81658e4729de889e0122794842dcea7a03ce8. 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/USME32101138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a58ac9259cce644bfb83e8c0bfe3d07bf2038200ae67e4801281d08e361b32. 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/USME32101139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902a257302eea6b08048b8c998bc5b1152e8b8a2b7d785f0d5ea31d8bd54fe81. 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/USME32101140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38125e2ba3d8b305450a886e31841f9b3436787b298b760ed4eb314f61d5dd08. 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/USME32101141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3428abad1d657abadb6b40f185b5c8027bc5e7086cad85ba6c149c5f4785207. 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/USME32300637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8e7743370d75b4bb5b2cea79f7a678ac66c4b6776a9b18261164360606cbaa. 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/USME32300638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae8ff5089085e1609216e7b462e4fd6fdb47559a004e6ed7116bb40ce81a617. 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/USME32300639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb317aa8e34325d156c57250f7bf37744b34c3bd54b65950d9df0257ae201adef. 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/USME32300640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee084235275536ef6143612e0d18ace5d85a1fe01a0c645a3d66b028827412e8. 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/USME32300641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30da69791761cc7642fc3eebc79388d65db07af533c9082acd81f083ce668b76. 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/USME32300642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb317aa8e34325d156c57250f7bf37744b34c3bd54b65950d9df0257ae201adef. 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/USME32300640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43d3d2358d43216e51ca7369e1149e10554916de042e51add69df6943e45e18. 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/USME32300129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x370ce20446ca9246e5f744852e3351cb816463ecf94f9db4b9e81d96c2c1e480. 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/USME32101129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c70b69b5c65a80dab41bbcbf8db68bc86a6bb8eb6d2614b93a32b7ea9e6dce. 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/USME32100158.