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 0x5c3e3afb69c420410ea683fa6d5cbfb242a7f03b07ab0132deea7eb3bcc629b7. 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/eca804cf-29ba-48cf-bb6e-b70c15d11eee.json and https://artists.proofprofile.net/proofs/artist/eca804cf-29ba-48cf-bb6e-b70c15d11eee.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 0x9600a9f5c13fd4556327f8d5e43497ef2e0c026382c61c89914e3dae2ae10642. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZTAT2327146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32aa34b74c23d2c0c7b47fc3bfa889d165d258c910c2a5e6bdd5e230649940ab. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZTAT2342526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d25be352f74593000f7f5901406b6ce5e244eee56a3b030a3335ea3842c949. Chain 2 (Bitcoin): anchored in block 958117 (2026-07-15T07:36:28Z), 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/QZTAX2312180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bca7b50b801c374a33bc6135a45a627191b43547074fc16d49f18e337902659. 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/QZTB32373495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29b78407a000f6f1233d51740840a468a8ff43d032df186ab14113cf5eb11a15. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWR2461701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921d12f81cfaaee4d1c727e77bee16f6715ae40851106f60d90492bb941e0255. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZZ772486935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85d7f066ee7aa9f46e0b1c2ec224a6b893d1fc29a99337ca3642409c7a29f3b. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QZZ7T2479385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdffdeab05f2020204044cf052cfbb3314b501ebc1082db1cefecbafa327295. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/QT3EY2416506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ffbda1163199403e52a422a89cc113f95b9367fd5780c692215ba2fd5f5dec4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZDA52525689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4cac851e9eb8c96beb9a469898657a46915a6c86e4d7425d3e056e934f388fc. 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/QZES52568740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56a84dbcfe3e1f68d289895bc617e71b606da710be14442ee058f9997ed2266. 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/QZK6N2535265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1985b00cdff17d878faba202a265e777d27f4cee909c081a31bcdc613d3fe8. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/QZK6H2505122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c177c6275cc0fa4677e4c4c035f690085bff9a6d8e1299f9cdc60142d74a614. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZNWQ2587437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d617e415ee6947be105e02711c7f65b7bc802b55116d4dd3a59476b6ecf7cd. 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/QZRP52526984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb2b35fec07e697d5aa5433d333068c0051fbf50d8ed2a6f099757ca092daa57. 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/QZTAZ2508062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3acd08b46f40dbdb11092d3127d8bfb193e51fa696690302ff5eebe3859600fa. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/QZWFQ2551184.