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 0x2cd8e309de039f360142c19fa4f60d0c3abeebfa9cbd09d19fc353e458cdf9bb. 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/57c35bff-0829-44b0-8e84-11faa6fbe275.json and https://artists.proofprofile.net/proofs/artist/57c35bff-0829-44b0-8e84-11faa6fbe275.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 0x73ac6588bdfd53cd7c95125561601d30b2fef7d902f3a3aa7a18422805c53f79. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZWDE2303666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810a39775cddc24c106eaed833c6b4e367c1a199790ac7ccc51e91a74b9d4a0d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USLZJ2366874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa5c7aefbe25f2f3e09cbd64d0920af8d674f72834b304eb4b71db0cf219336. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BCMNK2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd741f4e04aa9e1fab01e4ecf5ea97043aa34004d650ace87416a2c577536eaeb. 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/QZZEC2302328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc889d30a57444c46f7dd6a0434452192bee1fafbd8aeb0e56825d372cf02e4a2. 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/QZZEB2398683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793f862aa15826f105d1593cca1490f1badee74ae9f85192c7ea75d3529df7ab. 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/QZZEB2398686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce7d66d7e10200e0d17f77d76293d00dc721d93078f9aea3f3a3a3e8826501d. 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/QZZEB2398687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8ff2214224ff9dae7b5039940f641abfc9c4d8bb63f545ba9a4259d72008fd. 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/QZZEB2398689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0a3c245e23a31bbcf70b8dcc1e96c0f5134ff0307e5f180e0172f0b0d41c91. 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/QZZEB2398691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055f0a8e7c7b01ddba81f49b5cb2c658c74674cb14b3e30509a8a1cfd044753d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZZEB2398693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3246089aed6304dbf84effd39b3e9be35906e7261426764f89e54e5df02f38d. 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/QZZEB2398694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x608aa2554935c621bd49bf8592359cd5997e08ac229707caa46353e9c1720276. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZZEB2398695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf6be6b72116fc4a722cf245852d7d4ce7b3e263616d19beb97ffc6408d00840. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZZEB2398699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d51965453809f8a9f3dbb8808ac336e55d177d504c478ce310c2f33e4bb3b6b. 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/QZZEB2398700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee579ea894eb3b8ebb64704d5db7ab1b6884162df62e2b8d17e9e9718998dc1a. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZZEC2302329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x154c39c8ddbd060c35e49445a16e7f9ca7b798f2a50937bc62389c72411d353c. 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/QZZEC2302331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b677a291ff6d93246be89ca26a694b617c8eff6fc824c4427a27d0135b7e9b. 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/QZZEC2302327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4260ed30cd16703ef739a4ff4a408f362f37f9f98f7302f8cec1e37c02d1fdaf. 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/QZZEC2302333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb372fea67024b0fc32e3f3cfd56ffa36523b748a6f508964a97e6f4da5cdff0e. 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/BCMNK2100007.