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 0x04e0397f15456e761debb64b4a51317dfca2de9e3b291d89d051764b0315469d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69a349fa-d7c8-4b1b-8435-6238d0f4a946.json and https://artists.proofprofile.net/proofs/artist/69a349fa-d7c8-4b1b-8435-6238d0f4a946.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 0xc86a4a304e63fd74fb1c0ab4567e932224d05bb1876debdf423e7712c6f99b02. 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/DEND11104903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe81603d141567729ccbe3750e70b61c3ce2e4c2ba91efc6a91382ebd6a81f275. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/DEND11104910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db1c9c4eeec51482e0a1ffbf68cc9fb8fc40e0df36df7cf0514303b708e6576. 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/DEND11104914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1411e59f07da5720ceb664ffb9a21f034cabde392aefdb01a4c627d573afe46. 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/DEND11112002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6afbe3c8b03358e22eb8f1598e3435bfc4d1aa7cb8ff531c3cebc3a608bc43f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEND11112003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd74124910ff21500abf4cfc2dbfe97394513c24b6e5999d3979c4ee675093d47. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEND11112006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3e96eeb4866ee0ce95c7fa05526cb9e7372aeb0ae71b75a2d1bc00716abedd. 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/DEND11112007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b4610b20d7132ada10c75c0a9a26604965461d53ceb7526136aa1dca1ded90f. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/DEND11113103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7701ba9507e3f6552a74070ad19cdaffada5bdfc220709fc2f1994e7c9efaa. 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/DEND11113105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b95c5feb9d7fa37b9067a24caa9bb99345f3ef6a091dcdaf0ec1635460f636. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DEND11113106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9c538c08518b88e4a082fdc882e9091fd44b799d56942ecfc6b2dc61505624. 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/DEND11113112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0265e8165609856d0fb11eeb838431296e45172ad1d048965d84a4d6b39824cd. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEND11113114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255185cdf9eccd0c869e9af1aa73a56bb072f8f866228e962c12cbaf70e6483e. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/DEND11112601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b071d866f6631c7c145770427677b38b22458e601bf10266ebfe8d5ae7cb371. 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/DEND11112602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8ccb962b5c887463e1562268a589b567d23a286c48ac6518a4f02167232f473. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEND11112603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa0d5c3e61cd40c44ef2707d624314641e746e7006d93a3ba29f28f2de7019f. 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/DEND11112604.