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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbec07d3352d43e63c71d11980241035a9313c04e331c6059ca5883872d626a8e. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d74a470e-1511-4b7e-89a5-aee87b089d8d.json and https://artists.proofprofile.net/proofs/artist/d74a470e-1511-4b7e-89a5-aee87b089d8d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4031c243c5047ce37604409dd15a3253d7fb667da4faf4a295a3c4555eb82277. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T18:53:38Z), 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/TCAFL2161886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fae3af02a4d0b9b05e4d6d73082b769034cb08cb5379cf39efc635cd2648814. 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/TCAFO2125645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2a9120594f96a599052e58799142599f308803f3a741e4a4d81b63025d5d49a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/TCAFQ2193519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61982fbc2042e8997f92abf93743a90a878a2e0564706d9b81ff3f2aed902f70. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-17T00:52:50Z), 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/TCAFS2158422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6265ef59e9f788723788c0299b76cf28454198f1a03a6dd577c404a0ed61dfc. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/TCAFW2143563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb673d8a03e556aa479cec8a906583381a716a1409835d14521f7e45179ee88b. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAGD2224114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17ce82b907f6b8a81cb0e6e6cefd0e0ee178b9addd9d3b6dd89fb1e746e68f6d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZES82127305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42f24f01f0a6a6a99534cae7ef0e962aa3a5b128b41e05b2980fa4f06ae14189. 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/QZDA82154674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd3bc8dde5ba5b4e5d05dae574de291ea7ddd4a6348c56407e7f5e4d4ee767a. 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/QZNWX2113348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d8185c4f37d1f0bfd502b7a211fc051c0ff7c084589f5db0fe2bf957c81c86. 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/TCAFU2108645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34bcf476264a232abfb0957c82e0aa67cf7eeab67a63e1273d626447e211db6. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/TCAFO2113184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7d24a396786291ced01b0e8e83043b8eb98bfc74bd36df20894b83115b3323. 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/QZNWU2175539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0d247c401cc48ea06f22ed2fa44cb4b85c0573c6596788a74caedeb47c72d9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZES62145517.
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