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 0x464fb9aaa76cef979284c2996aa3ea5b034d051669fada2639cee1934b3eeb71. 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/0a428f18-29f0-4199-b325-66f5e6e05d3f.json and https://artists.proofprofile.net/proofs/artist/0a428f18-29f0-4199-b325-66f5e6e05d3f.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 0x589f2adecbc432a5ae3e64dc7a20b78d8ecc1cd1405fe9c02dbc4d936f5256d7. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/QZARB1857016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69517cd36cef097e122b2570b75cb9620c2f36954739565447ac0b1b10bffae3. 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/QZES61868537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabeab0a79697ea0506b6f7e603aafc8d030e3d08da13bafd76b34b7067bcbd7a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM7281938040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9aa9ddb05e1fb3e689cb7196510a123709b230ed483e7d2c5755034ca6a26d3. 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/QM7281938042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2e82275259826b1578243110f1b060a6f2317f69e5e95db4d1abe380985025. 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/QM7281938044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaf1dec9d7a8e95e976172870865158b921023e1a8b325b9d10935555b88a69. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QM6P41980240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c902d50c3823dd9f4ee34ed253ea65406937683792d8a6a125f7768996ef8f1. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/QM7281938045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7bbfb99e413fd5a3780ab52586d351701671b80cbc3660a9b7a8309a25969a. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM7281938024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea4d706576af59816d38a328f93a1fdd1451a539d4bd59d007cfb99ee6a8d39f. 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/QMBZ92008120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec44f2e210f31cce9f7c6903f232f34226bb0f889155af4c8fd6cdf20442279. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/GBKPL2152975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8398db20e6e926567dfd1fca319ade4c59f998a0af8712e862d794b7e081c182. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/GBKPL2161802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfdf899925fdf714b5ad1bb7325d25464ee3a8b19903e54f2a9d2b5172d321f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKPL2292953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ff0d13f8e78b1203368e533d88444acac38d4b0b0bc49cc2febafe1683b986. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QM24S2206443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497cc79093230c916f16910e8280dd7a8d203fb6427d19b943eda7ff813ffc72. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QM4DW1802726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f49d33eafdfac7538746e0b3af532d1989120d2f88fe2104548258071306698. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QM4TW2352857.