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 0x1853fe9247eac55d6e3fc6573895c1e9018e3a6a00931ef9d50c15721df10711. 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/4fe401a5-d1cd-4f9e-86c7-5aea130c26cd.json and https://artists.proofprofile.net/proofs/artist/4fe401a5-d1cd-4f9e-86c7-5aea130c26cd.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 0xe682004232d902ba19533b71ba2d7763f850763252573d49697a8542b3f7dd79. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCACG1565935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a39517bcf7c4094e9267d044b05826fc390c614bdf09b120fc9f88b24584c14. 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/TCACG1565940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4213256daf35ef4e0cedac6e25efccdd4e0b82f17194fa78192f7e323776e611. 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/TCACG1565944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea11451c28b1c3c7fe192c0073368c5ebd4581f2c0269831abcf1fdce07f587. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCACG1565949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab51d2defb0c9c65110c0c6cf61cef683f5d43140b57cfc005449d53df0b1532. 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/TCACG1565952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6b479f7a5a8dd4a04ceefb733c40e235d64faeca80cc002f492d64f547b89c. 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/TCAFH2021907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6295b6a56897e08f00806d490cf0c53888697f7feb67cbca538fc6bfec90e12. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/TCAFI2161320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09156525c1ac3eddf3c22732cba5c76984c9985d3e464595704fc97fc330ce8. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TCAGS2217150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ab4c9631ff649c48a164bde1687547a2406e3c7b18e33c8552e11188d32266. 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/TCAGS2217165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9a4c6cceb9b3e43a3e30eee05145f65211e27af6bad25a6d74636af50139f1. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/TCAGS2217174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd396cbcdebfd9802038d9c4a91b8ebba2c1f8f3e1c0226df7567e4c8025c8d. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/TCAGS2217182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41f0767a72a4b968db77c6b9c6fba560848df5a37391c9b285f71e0c7bd367f. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/TCAGS2217188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cfe86073e894a119fdfb09778492f81aa0b9ccf64d8e659d53fd4e0ac52456. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TCAGS2217196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e19493ab9befaca5bf73e520b3f8eaebde164bd9716cb4dac1c1307512df6b. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/TCAGS2217198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9466e55ce5d70318057715779d6ec4e98b837c23b3a96e585e5f02350b696fba. 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/TCAHF2382623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0019e5d631db906a2136076c29756d8e022a50bcf8b7eec93439e94cc0561e7f. 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/TCAHT2457598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa241c3d677786f55d74d03e247bdebc4e35d97864e861e796c898a54f7833c7b. 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/SE6HN2491989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8460f4342136afb77c11e0b07b957f4271461dc49a28d371c15e0892bf384421. 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/SE6I32450123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4130fc07b004f35defa0daf64d28a0892d38557320831cbeae5b4f59de7d87b4. 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/SE6QE2466231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07727ca7ca905fbee48071d0d65d5529d80d5a746c4c41efe843765165ed7fba. 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/SE5BU2512288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076ac4043924420cb0c2fffec9232439fe3034daa7a4e0596acdb4712d902725. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/SE5BU2555597.