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 0x7fae187b902bc77e8de39df6ff9ba333fe6614546637658bcd3a073a1909bafc. 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/478a9b80-44c4-4f18-898c-f7237eb2aa9f.json and https://artists.proofprofile.net/proofs/artist/478a9b80-44c4-4f18-898c-f7237eb2aa9f.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 0xdb0cd835f60b534750c3dd3c0dddb9ce78fdfff9f989ef2996721480ca3443d8. 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/CACWV2242972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b4fcb78650cda6a3243819dba4421a1ebd4123377d49e9d4eeecd35d2f3238. 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/QMBZ92296661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a7ad6980b44368071abf745b04e5f638896687cf5b308a2f1be87b70d4db1bf. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QMDA62296864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f1db67817d4a74c42c554779a66ecaf204b1f8d2bc8fd117a977fda17472364. 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/QM4TW2333140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8779d0187a5a5dcc52f716c96f29eb9a2b5678538ead930f19d0692699821757. 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/QM4TW2332852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bcc5c7f1bc5c373e92ec751720cf64aa9d8c7ac9810f15fdad666fbf251176. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM6P42388955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f3ca9c7348921910efafe9445cf558da9ad6a4db4cab9e5b68f30892242c5be. Chain 2 (Bitcoin): anchored in block 957884 (2026-07-13T16:55:06Z), 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/QMDA72362476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6280aa6ee2595808851e0c51fb62d781faae4b18db05690bb01783d6e2f8704. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM4TW2412245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9ed04d170b39045aaf3e90215f307008a505b5781fac8609da85d18e712c80. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T20:10:18Z), 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/QM4TW2438389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6049d7540ffc787e9997ee6a6fb20fc51c0d6bb4f11e212a38270edb35e2f784. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QM4TX2453746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x622341d4fa5be39d18dd7860fbf7a03cb72180e2bce67e85d44f87bb6b75860f. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QM4TX2453747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c7cca4337fb3d5dd01d7783b1244525fc5fff49e9e0c356276f47bd873e64dc. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QM6P42469431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1cac653bcf55144208de9f6bb33451755314f9377a06b57a35b0a497e3fe94. 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/QM7282455182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30ed7c378289b5e556922d10af797b7d7ea819e8ccdec3dd8181fffb695bcd67. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QMBZ92439947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9f9fd47d86953b6456a08d8d4ec5c20bb299d616e4b2d38d51be33010c48726. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QMFME2475708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc7c57d9bb16a43bfee905e8cb285c5badf3d719cf40f17e6e0794a29cc4a61. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/QMDA72585254.