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 0x9c045e090a24bd644b1895868ccf148941085bd383879805a9a33c0fbeb4daf6. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6296aee-25d0-4fc0-a328-1f72d273424a.json and https://artists.proofprofile.net/proofs/artist/f6296aee-25d0-4fc0-a328-1f72d273424a.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 0x697c2b02ce6a486e29fe762acbc741dfda4359fce5643dc604692f1ec82d5da7. Chain 2 (Bitcoin): anchored in block 958091 (2026-07-15T03:17:03Z), 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/ZAA020300407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5ebfeba1c3fba463fd772e32705d424d93073044405e2834a3a77ee2244463. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ZAA020300408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6df6f3ea96e572b680b3ed9be3a6bdc6e4613292bfbe2305bad72957894e80. 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/ZAA020300409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235890de49c9f7253ce5bf4c67cd6d00857aa3cca8b5003f0cbcb8e5245b9b9d. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/ZAA020300410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836036f6629955132d051ca0151fcf307b0d2edcfdf6e2b6b83cc28a63c90f38. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ZAA020300411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3763015e0d21c1b7508bd48bc22108276d8c686bd084de309ad4a704ff31e66b. 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/ZAA020300412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b4e1be6fe5c9b8c95df2477a0a74f0c2c7efab3f9baccd3045416901713f04. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/ZAA020300413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8190f0dfce2f758158336eb80585fd50df5f75184992575ef01d7c5488026a07. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/ZAA020300414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de0d13309ef8d08d4e495648f00643d97693866d30462a49ddd78a15df71103. Chain 2 (Bitcoin): anchored in block 957771 (2026-07-12T23:27:28Z), 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/ZAA020300415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b3ad5191b06c996fd7e1c3930ade664d1dd85135684dc6eb46565a465f3ff5. 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/ZAA020300416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827adbdb154c650156516eb156d8a7c5fd86bd8132284a6aa6ae5339c0b16d61. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ZAA020400414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa639d5e88625f06bc1d983fc7c85794fc8e56bb4fb5b0043416ff26bf095fe03. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/ZAA020400415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c07d6b0dbf24b546f9092ee0f2316fa3956032cf7f6985451f8d38321bc7325. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ZAA020400416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c04a07f3efa5795646bf97d0c6c3f863a85976fb68d918c023dde9893f7c9b. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/ZAA020400418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26019ca83d0c94e76a9f845174f0c842e9d3234e7e1e84357db164818339cf13. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ZAA020400419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73b4786e4fc3302d69c1457c87e5384d59db4c5cfe288ae8c686893c68b553c. 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/ZAA020400420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd08334a7dbd3e8484e260b9b643b0b63aa64b1dc8d5b3748d4128e01f4fb562. 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/ZAA020400421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5baf3d7b5dff9557349ba21866c8280e549b9531c967bc04e94ad62ecbf288bf. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/ZAA020400422.