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 0x339bff4cf491cf01f7caa27ce57f1a6cdca1b552ed8ac3ecaf99568ae77f4c48. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3a8bb86-cf75-47d1-a190-e42f16b1f12c.json and https://artists.proofprofile.net/proofs/artist/e3a8bb86-cf75-47d1-a190-e42f16b1f12c.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 0x19ae665646b25b73715366d0e8493530ac108fe844e3d1969a81193dbf2ce820. 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/QZTB22467145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37612e35bf28d5d3de3eb5dae9d9d0720afd2e25d10312017b252269a3f95cfd. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QZTB22474834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b4b61edf0b2912dea7436c5a252300ea969d6d85729ea74f7bf352cb8bdf3f0. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/QZTB22476237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125c12701a63633959c5ab74f77597915de9686ef17ed19a5369b25e86fafc8a. 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/QZTB22476263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889fc510557e2874709b743f0dfa3510cbe6c468f0bd2673ff6ac84ee0deda1c. 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/QZTB22467147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fdf8057058ea12499c2bf029bf7b4c9c0332b72050009a1a3958c4590fab24. 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/QZTB22483595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebeac0f37f06a28e05e289f4257ed1e9ba0ccb2b609bce5494bec787d9be9952. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZTB22484536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c21e359e6041f97bb86ebd9f2838fa842d2302602d62f51cebd22063f5d26a. 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/QZTB52496809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cea4058b1e6f034b14690768dbf31e66f59610a89f4bdfe8d4b9c4976091f2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTB62462368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ee07c75dbdbeae16bb6399adc7f5b738fae84d099c27dcb74fe929f83dac2a4. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZTB62494325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd388029d6029bce96c53fe11dc3f6b8c18ddfc1793cf118a5d80ac05e39c1432. 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/QZTB82402196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4361351b58e01247331ced42b34e5a071bfc229c523c66e18037ad999fd614c. 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/QZTB72479922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f600105f5c8d24e13efa04eb969a72af4d7019f3b6ecf11bf56d8a4e7a959a9. 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/QZTBD2416142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x783b542c452baba13e6fae7d706efada7b2390fba54e866a3f251988e6201367. Chain 2 (Bitcoin): anchored in block 958417 (2026-07-17T12:56:50Z), 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/QZTBD2429167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd901612a65108c55c27c74f5be231efffc5fb1e20be34e8a88a0e33605882074. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZWFF2429289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da35efd34be3bf0f61a996d2708ce4becf7dd5797ffed9e716ad91d9be31022. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZWFP2402379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf767ea70963b3c4f1eb1dac37e75f61028ae24056205a9c80a8961e12df6a086. 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/QZWFX2438750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb888baaf1a50720f20d5cfb3f2de7a401c2ab7084f3c2332249d7fb641770ae. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZZ772460938.