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 0xb76cf27585a6757871459c08c4ba4d5c13d93715fc35210c63fd7ae0c9df6854. 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/647419f7-9752-4114-b712-cdd528c7c8f6.json and https://artists.proofprofile.net/proofs/artist/647419f7-9752-4114-b712-cdd528c7c8f6.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 0x4a3852291656d46ddbfa261f7a80ee2e60cb327d7c1decff8a46b245cae24fe5. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/PL56U2200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904fa3b7d1d2490c01c78cb7727496c4276e487feba20d39f4e959d4ff9ededd. 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/PLA552300730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6fd44738581b5b2aa6f2d9576d373d88c28aa23f60b9f315794add19b6761b3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/PLH342500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c108f46c10ebca927c9935bcdd1cb86e0bb0a266753a933bbc41181df42ea1. 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/PLH342400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42b00075ce518d88933db05490e227ed8dfab84851efc8fc817143edf2085a3c. 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/PLC062409815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92edb35c674d6da9c75a475cfc6235d4a7946b3e5507db9ef37e9251b5dd52ee. 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/PL56U2200102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689dbbd606c9c9b72ab25083f3465ed897c19825145873e00c22c5beda64f986. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/USA2P2113812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81a09dc6cebf12e2a0ba4900a6d0e42b5ff98b903dfa1b18bb44cb9a81c27906. 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/PLI369972400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046b78f9b0a1ffdb638e9ce1e80ea8aa3f25620d90a6673f8689bbd47501ec33. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/PLC062387182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ea7ae4693d5aa274c384a09200c2e65f9f689a1e89994109c30dd5661bcae4. 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/PLV402101162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c46ad8ad48c25f9e291c17a56e429775089aeb7ebd25ca1ba2642eb3958fdde. 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/PLC062432320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476b8a2a09cc7a98364ac7824ac1b3a24345e584ed68afda1412096306e51432. 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/PLC062432322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c36eb73a09ffadf4701ad029daa9a21acd3f2549863386e23b5cfd688450fcb. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PLC062410289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0716b4fa0c5ca1af7d5a7c2f6d8a17ae9b135827683f16a728bee925df7fb97. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLC062401542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aadd6052ef5865c4f892205eeb01f4dddd40e80372b000c0a1c9ac89342922e. 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/PL2DY2400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ef59f9a362c4dfdd0ff3ee9fc92ed0ecb3cba6a8da95d3b3f26b314e5bb655. 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/PL2DY2302389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aadd6052ef5865c4f892205eeb01f4dddd40e80372b000c0a1c9ac89342922e. 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/PL2DY2400303.