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 0x04a13f3f9470e0039bdd9494cfd5cf7c0d3e3e62706ed299a35b06f195252541. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/caf04f84-8fcd-481b-aebe-cdde15eaa040.json and https://artists.proofprofile.net/proofs/artist/caf04f84-8fcd-481b-aebe-cdde15eaa040.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 0xd08072ac09f68abf2e1c8389c22099008464ee24375d104ef57471ea94f34daa. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/PLC060700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe475b596a7b7c49d656df1c8857dc2fe9f99376a048554832a74a07e2b7ff82c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/PLC060700029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbcc14be3faee42eba48df38aba13c2789c5b0a5503a97b645fbd5001814852f. 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/PLC060700030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd269ea74d793a7c0fcbc4f759ca8d9032af1edc8462cdc4a9c421302455e44a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLC060700034.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1227bf796228f9e7e6f8388fe6ae1ad60e20de155968f938a0d25232694d39ed. 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/PLC060700038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618763e10d4aa025e8b1c028635b5cc85bfbfc9f35d5d45cd5df3a8e135b1778. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/PLC060900493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5641013ef5ebfac1b984df2d0a88b9cdd239e9779dc6fc77473225ef9b90e5ec. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/PLC060900496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9121a696b387add18fbf75a1f900066514e2a52d2728c791ef85bc3c5a0d8482. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PLC060900498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9300dea27bb5046f3e8280752d1e3397cba1105dfec554ed8a8e00c00a42ca8. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/PLC060900499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ad63f9960c2af2b9a5e206d7dcf116d87e6a3b6328ac03f60fb28f5d8c22a1. Chain 2 (Bitcoin): anchored in block 958395 (2026-07-17T10:10:33Z), 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/PLC060900500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90711d6d64a139e103947a3cd42d502e026519fbcb8e1247108b8c098e695fde. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/PLC060900501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b01a21382abbef0517d6c19c458395b79711798ca7db9c2e6c4bdc5dfd7cc1. 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/PLC060900502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x586440b69cc9896da8641f7a1b9d823456a62ecbe68acff3c2080442b09cbd65. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/PLC060900503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc837b673ef7a7f72e7dd248e07d4f24b4d26ccf44ccc8c437f9b2b5048853c9b. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/PLC060900504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a92a4f5652366263878861b637934034606f01deacfdc7a1ccf0ee53b7d43b6. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/PLC061201984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bccb71702465deed003765b9e4ded0536b3e0ad0ca7f34e18805697ae1bed6a. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/PLC061201985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6134a5e6ae616c6fdebe9195ccfb4b12adbbffe70332a5a4ce6c911379e4b3af. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/PLC061201994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5025d127fa6c5667f1693e9c70a8374ec95902e18eade56dc830d7905cfa01af. 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/PLC060900379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427493f89a304db9e073acb5e64909411299134943f837608c5fb0d4819143fd. 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/PLC060900380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ece4fab3a7a49e8f43a2a4f7d249a87f8727a0fa3442b9c6df29cb87e2e435. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/PLC060900382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b67c70c2d62a3f1200f53d52ef943de44554c2d6f6dddb662a6d1d5174ccea7. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLC060900384.