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 0xb50f99516e621bf376a8be2587347302dd03206f229b8fcac6763e2fc77a1011. 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/8d53470f-dcee-47f7-bf76-acf3d04706ef.json and https://artists.proofprofile.net/proofs/artist/8d53470f-dcee-47f7-bf76-acf3d04706ef.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 0x588337d2e6cd8fbe8c028949461360add4623d8e0815cd4dbf956f52e1f4c8a8. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/QM6MZ2170820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79566ea31320d49aab58902a230ea25fc679e511b0055a58c0f28804bcaee659. 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/QM6MZ2170873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0644f9c08443e3f6da5c17cf624dca6d1d77a329ef8c041bb5c8cc08e56f2ce8. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/QM6MZ2170877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf4dc65849a8f0b06d435d961a919501518117b09a9c53b8f495d558d552c6d. Chain 2 (Bitcoin): anchored in block 957546 (2026-07-11T09:35:53Z), 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/QM6MZ2170883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80e34e573e68779b8035a310303b0568b1c99bb6e0f64d0638954b7f9ab15521. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QM6MZ2170887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcddb39e1b6d66b0e532b886b4e11dfa9c17df071a9d2cad5d7cd9880cb72df0f. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QM6MZ2170892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4e055f6ecf93394bc72badf12669c10d79d0bb2ccbde8469f05c592088f97bf. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T13:59:38Z), 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/CAUM82100452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9e6ce38368bf1255380cd7c3ae328d6a0cceb5bf2a3046cbd9a40abfbd15e9f. 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/CAUM82300328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dddac01203ec1dc9896aec6f262208e9aeeed1152444c0ac1059a9fd54e117. 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/CAUM82300329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b5b818c4eac5cbf5e4af1aff79af91448e9335a2684b6473f87afad96fbb97. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CAUM82300330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70479b2db42fb9ac0e6064740fc948440a31dc612506c039bc6e6ee99a870a3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CAUM82300331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb437e60f990368a3a5ea8f6c2a804238e00679599c8e79ae1136ea32cbaa4af. 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/CAUM82300332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e397b7c5d08bccd03bce96005fbfdb93e8a31dc61512d69eca6518bb294bc23. 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/CAUM82300333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x903ae5f3656443fb3dad46ec6591728aad7cf2257ad27fbf4259b524c5a4bb24. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T23:47:52Z), 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/CAUM82300334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ce7bdb38c67721fa6412364019f27b10b9ef48f7ad17749ff20fa8e6f82918. 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/CAUM82300335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeed3a928b512846b5930c9de630757adca2f5ec6c39e0671e539ddc66efa4004. 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/CAUM82300336.