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 0x38e7dd6bc8fdbf4309f5c2835ef07884763143804c54ba695a3afb97cd9abb91. 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/0054a05e-dc13-4744-bda2-8a2106bab517.json and https://artists.proofprofile.net/proofs/artist/0054a05e-dc13-4744-bda2-8a2106bab517.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 0xc641b72737a349fad915197ed78173131f5047dc85c65a0d096ed99ed884b357. 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/QZDA82150052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8f2051993f2d2ae4b3ddb109e3fa07b358673ddd4d25fd9d965c50e951a682. Chain 2 (Bitcoin): anchored in block 957544 (2026-07-11T09:08:48Z), 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/QZES92145395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed93bf01728266b04ff4ba8fff2548a2ec20b88c5c07ccf93c10d23aceb0f937. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZHN72145207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667a650d3cc6bcbfe9e9c189c0a2b82f01b163dba3bc50002bd04c7c240e4959. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHN92174578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167e12e7c35d42c6ac1855e4b15601350cdb062ba8b7b13c69d09fdb459dd0a0. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZES92254974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa56fc27d22f8117d16926b75eb99fce06be6e1eb7b436281471ac651dbe5bf. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHN62279869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3065d26ff7b5980bc9b506152229f73abfacf8d60d6a6198f9c639e6bae00c7. 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/QZTAU2320159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6639ba98be2b70e670efcdb5977c4e4ce09ae44d08d87edc591877442e504f38. 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/QZWFR2327087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fbbce9b4445caaf34fe0bfc18c380055e6fa57bfb10cef28cb71c34793c1c9f. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZK6N2428147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e55036b7a06c4982e4a82302066a3c41d8a9da9fa38f05391b48cebc59d72a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZWFV2496011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x347ead1a8e9eeaaad2aec5be52e5322578685b87817cab87e5ffc1d135cd7c92. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZZ7V2473669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3d7ab191efe813f4785b394671d994296e20b0d92231ac4cd049de540be067. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTBB2515997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9d9be9b1d04c6ea4dbfa74ad78834cd5d6e5e0ab10982997563cb7506055788. 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/QZTBE2545054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a86227d28c8aa66ec33e4cca92d052f334307570de98980efe136b3f95eeb7b. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZWFT2584833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x084ae45060f3baf591894313e4a10134006373758ce26c71a041e971b32a60e2. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QT6EB2517390.