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 0xb316a65cacb84aba4aa4d80233b643623cdbc4a49ad24d1877ec4b3483810efc. 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/6d0c0a34-eef0-4cb3-860d-6d667e2fe801.json and https://artists.proofprofile.net/proofs/artist/6d0c0a34-eef0-4cb3-860d-6d667e2fe801.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 0x195e2fd882149d0bac26fd4023605dd660fed56529665d28fbd8b0b955d59cfb. 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/US25X2004656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x953f40ffb8fa732fc1c8188a93b061379cf21e0a73654bf4ee3b4021c35b7e12. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/US25X2004664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833b8098444b3bfb0d3a59a00d09b9224dcc2b43f74ce78820823942c3609063. 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/US25X2005146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b15713a4bca464e08264ad380bd42b62879bb1d363a5035566d2c18ff4f402. 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/US25X2005167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e0994c55e8f4aaab5a1a9587bf0fd099e25e0ac8a8deec0664d2f9cfa90539. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/US25X2005181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6adb2df05e4f54f32d850bb6996d99d1415dbf5c229de143bf2fcf44d81ddc5. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/US25X2101193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf4d9da62d6c4eb9a9414a3628d63e50208f14883ea65c0ea161803b81e67ef2. 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/US25X2101194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d7e304b08f8703daced6fc67a71ba7f950d24480f0f4d5bea8cc535e5b8067. 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/US25X2101195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c66252177bbd8724c87804c4dbbc246557285ba2d82208b506ff7c4536ebdc3. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/US25X2102367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0cd508d11078df4d4e6ea46053a76f3b7b53bc761420cf98d8a5160f6b0403. 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/US25X2102373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e446e4b574a035c616f0a7a426811d0aca1ae4cb4d7c307a8007b8c51bd3a2c. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/US25X2102377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f398761ea68f4f104f5d56f431470a2a146ea6489f6cc9e62601d795b9d07b3. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/US25X2102378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9246730427e2c1c6a0536e1462b045c5297a44869dacc2b7ac825b719c6b2c. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/US25X2102387.