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 0xddb2cbb38f6a2ef61cf0f1b4947b21c74d411c7624b4ab3db6c71fc0e2001fe6. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4c25f52-8990-4b92-aa5b-196e3b9f67ab.json and https://artists.proofprofile.net/proofs/artist/d4c25f52-8990-4b92-aa5b-196e3b9f67ab.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 0x42d4173972f8b852306e8af6d2aa80806c8f6ce6e1ebd44c5f65b4dfe69e007f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZHN32379993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f47c48ec9bf01ad5aa88987aa24985118317349a9e44ec1049061f3d9ed4679. 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/QZHN32380598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13ced993124616660de22bd9be73df662c1affc55c292518bf74cd9a03f76b29. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZHN32380607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130b500b2a2c679142ca3f46b861dc746a18d5b62ecaf25c736d16691d7dcb84. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZHN32380600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434f6e2bc306bdf5edc687ad0e3035382e9dbaf2a6f0c04cb64972d2b127ca8d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZHN32315720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80b8f24ae743110f87b25fb42c6aee18d7275e1eb15a2e30d3cb6f110cbf329. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES52419643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af4037d20703547d3ce56a2d4792f9d59cce44bff279cb8f8671972ad74e43c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA82460707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4208b2f7ba44b8935c33839e03d112d9c62a67d589077c6f1dbd9baa38314834. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA82460691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3362b57abceef0eb811e878f2ca7661a258499b2e3ea92b199dda6dea18255b1. 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/QZDA72475165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37ae4c19f34cd4c129f8be2c5de288b03a3a06c54ad96f68ef48ce6716323b3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZDA72475164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd97962b8e29768645023dd05c6862f1febb26ff0e52ec8dd99174bd8bd109f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZDA72475177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2314c8464d163b3f33a2c21256ce4a1431ce996eafd684bc8f6c44712870bfb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA82447503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9a4367f0d2a2465c200ee6937e52267ca72945a227ef1bf9805892a98182d4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA72475630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceca3c38e5e5cc895bdf4e490c83ef63a1502487d9a2cdc6632421b0f4a04638. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA72475176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb72ca6be864ad09c717975ba0d508520ac87ddb586185809663675503708a93. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZDA72475158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ccdf93b6579026445810b7963348e38430c63cf1b820cfd8207ced93b6bbd5. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA72475629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3df07a317f4e88f14b3f0093088cb61f1c43c6a9dfb12f0917fc45788cb1e15f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZDA72474620.