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 0xf671ebb6219de2461ae9936953ad360ade77202e4e59b7ae45414ec3e518dc16. 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/118b0a99-18e0-4403-bfb9-5d11a3042b09.json and https://artists.proofprofile.net/proofs/artist/118b0a99-18e0-4403-bfb9-5d11a3042b09.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 0x371afe1dd96cedcf8b1c6bf72163f7dff6a3153a8616c0ec978272ccfd7d90a7. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZAPG1746675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356d6710b690894795f5596211a4c1d8410f834a56ba164559cb844f49ab430e. 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/QZANL1701049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x461acce01923374de622310e52ceb1ad2761912e747997a10a43d1d336885fb3. 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/QZPLS2210002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74dd9cfa1d618d85a32c51f9eb35fb233529346bad9c28936b7e790b2eeb6c83. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZPLS2210005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8e5295934510d2d1e7d75d8d3db30cba200407c6fd00b6a7af82682320693f. 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/QZPLS2210006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7213619bcfd4532c9143b65b9c82d91c21e7eca8ca9e65008641802cb290c4c. 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/QZNWV2132498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d78be8b246579c6e863a4538000ca72f354a1cc7d49450f29e88c7d2c268411. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZK6P2194852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fda6f7735f4699596ce235ae0b3cf1557b1bdf5505c2eb05cec70d6d9b39d93. 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/QZMEQ2304575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed593db51b6ce4918e6b08411f2855cc55729dce7e1925566e7a0c3e777755b. 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/QZNWQ2392193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553b00c168bfe683b0d9a723d6cdb67696b5a6aa8f77190a596bfab73d5186a4. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/QZWFQ2421629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8650061c852a7517601540836b8750b4a3bd03d424633fee675791c45854db. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZWFV2491610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70973baffa3936faede0bb06b9d164a63aeb8b95106eff12847510208921fc7c. 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/QZZ782442755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7df968e2ef931757174e25b6e33a2587d0b78f76bb17aae2739d4e088677c0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZZ7N2459645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d442b045e70145545fbe81dd7ab9ea885520b7d8e499e656ecf8ba6cbab0f5. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/QT3F42423642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11ca0dc8173cf77bdc26ea29e32d68285583667c31b48ef0dba553d13afdcc7. 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/QZRP52503319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8bfe9ee350b878f85727b27c2458cac5d64ba584b322a482b0df09e65c52e75. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7L2586870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd47c3427f50640c7d39d5f638d21f3e385afeb02413c4ee4fe2c534af71b7b8. 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/QT3EX2599140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f1994f1cda752c15f28bdd8ed4e267313a7bcfd4691ff87e7c339c8eecbc02. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QT3FE2597956.