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 0xe18433eca2f79ac4de2dd6b721a6cf9ac845d1a6cd4bbb2b9014c29b44e7f213. 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/3fe6baf5-6b7a-49de-b39c-0469a107ba64.json and https://artists.proofprofile.net/proofs/artist/3fe6baf5-6b7a-49de-b39c-0469a107ba64.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 0x7d191cafd2bc0428211d96b577fc6af3583ac12efd68720851b6c919cfef07f2. 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/US83Z2020350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ff9e760342954474fa7899fa60eb5778fe7f829e3ca12a1141ec58102d7f99. 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/US83Z2228569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b70c3dd1e5652ed918fd2f6cd42b750845f3aaedb7f809a7dea5563054ce1ab. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US83Z2228570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a052c63f00f0d66f470cf29bf8283b742eb2cb27d7387efe8a180fafd1940c3. 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/US83Z2228571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3299b6fcf8a0291c8de05477880cd7eae8de96682de2a50582508a32e8b516bc. 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/US83Z2228572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34e7c5311c44b8e4a524d542b79da877636d0e753e789ef824513a75fe4aca6. 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/US83Z2228573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63975d7e2219ea6d371c2158a6aabfa121fcdf8ef0851a19a1cf288a95bdf569. 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/US83Z2228574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cea04cc3de6b09e7c64488f4ecd9f1197f2c4c37f0ebae7116531265747876b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T18:02:11Z), 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/US83Z2228575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af4c49a30365011fd0d8c69fe6f437586d6b505945db4cd90d0ee74facfe503. 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/US83Z2228576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83103e785075cb7a332b332f6e4d0e3017a73910291f45e6d5dc29dd23ca968. 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/US83Z2228577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d427f66e4060a53c3e11da915f0af59662aaafd9082ed092c7823eba59541c. 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/US83Z2228578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d42cf8bd2d36d2ed0be8a5a44537f5e45294ee838455acb1ad007323eaca99. 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/US83Z1904519.