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 0x2202e1fa78de870301438c26ea558357064efc2c07f91013a0babee61be2e4fa. 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/64b3a1c9-474c-4d1a-81ba-c4ce304ed6c8.json and https://artists.proofprofile.net/proofs/artist/64b3a1c9-474c-4d1a-81ba-c4ce304ed6c8.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 0x4fe2e84c01db234a07dd990001fde52ce018c8d3505192f827b2c57e97381e62. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/SEXHR0700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461b7a0b135517bf9a85d2caf3c2f7a296f07877c59f733d7e1b716729f389d8. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/SEXHR2000108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dcf5c83ad8ab10ed116f61ad512fe48521144840b2449018213c2c42bf3a26. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SEXHR1000204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3b8d7a6068fb0f49321a63374d3c533e8242ac5f9de806206b53c7f6bfc867. 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/SEXHR1000205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497e1409da4f1d195c4b5a2aac647bc61f12b905fde3c4a97a83892a677530b4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/SEXHR1000206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ade32a25e6349493ebca386019a9f4f2df6fc608d9afc4347570420951ca24f. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), 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/SEXHR1000207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02626def0554b92eac1a867103c684f9d0217672bd845b86830bc22db9176f86. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/SEXHR1000208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6754b530bc5d954189f00c9bc27c49ae93a6992d606108de3985c4c689c5e3f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/SEXHR1000209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3be07eec90b98120d86b96eb07d97a0671828b7bab4102582ff9295aba93a2a. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/SEXHR1000210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f39415b02fcf82a05c4061201be7c06d6d3a2c4aa74c5b12a3a8ce7502f4c1. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/SEXHR1500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a8b9eb33d8c14690165c1b74c3513de939bf1debcb7715f3807fd3c10f3f98. 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/SEXHR1500109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf2443851e4561e732ed1e4d1eb774cee6136ba9aeabb79cf043ca335bc19ad5. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/SEXHR1800201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc619f49e896828fbbd2185225ac8d75eef88a0f389a4afbcdd3c6abf701e1a3c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/SEXHR1800202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x807d02358900615efd3168e01537d2c14cc324624426b0976d8727aeda774edc. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEXHR1800203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d9edf8d43c02fa9dc055a512433ab01591578c5b1beaf88cc02847db9d76ea. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QM6MZ2422521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b53d3dc1bf7d0143061259535e1852886de1b7d7890bbd9b02a1ce643093834. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QM6MZ2422519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84eebfa9026e94b764441aed8672e22e05ad742bc416dbc3c29761f66be2556d. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/QM6MZ2422517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45271c320770363de14567ee640f8b88a3fb9ded4c219a587b149391d892f747. 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/QM6MZ2422518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b53d3dc1bf7d0143061259535e1852886de1b7d7890bbd9b02a1ce643093834. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/QM6MZ2422519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32458d365c97b360c53fa61f945a4b00319f13477a05272b5c59b10396f5d99. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/QM6MZ2422520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d9edf8d43c02fa9dc055a512433ab01591578c5b1beaf88cc02847db9d76ea. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/QM6MZ2422521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc883d885be8a282cc139ac13da33c1069052299a4e72eee331ddbd8c2c535d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QM6MZ2422522.