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 0xf22d88efc1e56c3444d5222721491c2a0d670913bcb088954d6cca019fa92835. 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/905b1e44-da4b-42e7-b776-3a4e14b2bcf5.json and https://artists.proofprofile.net/proofs/artist/905b1e44-da4b-42e7-b776-3a4e14b2bcf5.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 0xe7be73b725c1bfa30b463a83ae369309e4b0013fb9521d736ba0ec314e313641. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHNC2218313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dc61f9a816ed9be567f05dc88e090850496e951a16caadc2412d7061291e2b. 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/QZHNC2218314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a65316ec6efb67c7db60348caf8a0b3988684477328be49611d7d5680ad1308. 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/QZK6F2262483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c00b4b57e9f00893e5d6c78ee5a3f4ef76b3ef0733b8440ffb4a5e96eb66e8. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZNWZ2269789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83458a31147a5452ddade71352a9049c505dccf102644e45728613cbaff8cc0d. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/TCAIM2431094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1284e90181716dd3b5a87aac446093c611198272514a75aa72fbeb68a9c08792. Chain 2 (Bitcoin): anchored in block 958752 (2026-07-19T16:00:28Z), 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/TCAIW2462099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862ee312dc15fbb8502a1224fe498c1cefae0e4a325f5946652a3e85ec655bd9. 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/TCAIW2462122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502f2a83f6ce4a561cd4985da2b87bc7e1cfbedf1137d299286e13d22b18d9ec. Chain 2 (Bitcoin): anchored in block 958920 (2026-07-20T18:14:22Z), 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/TCAIW2462164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d83910c2e025e93672a9c30fbddd9d0620ce011b58691f95dad8df6f3cb8ee8. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/TCAIW2462171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1857ad2c869f022f70771d066a2d38e337ac48ba45d39b8038cdb971a3a99881. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZMEP2500202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675c2cad5427e101b1cab69300ee4f8e1c16e6e0def4618c3828e2130d932841. 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/DEZC62592037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0810a76b55af58cc32fa598ca4f466e6f8852996dc2c1bf77206d4a7e2c3ddaa. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZTBE2515296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35c9e4862cd8ca397e3d2158cab4a04c7052bcf0723fceffe2e1e2aafe4981a8. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFL2511072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b17c55e751be1f45ac8bf3d8ce972cb3b7dfc2a1d2bb800310173b71b43857c. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZZ7T2509454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedd42e7af1401d1a12cd314a02a74cc5af1f93dffbcb8b2b5882c799a7e635f8. 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/QT3F62500163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5a90f7ae4259499df8c225e63ca4881403b5f57ed6974e751c3de725aaa233. 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/QT3FA2574016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeb0504e98ef4527919a5789b93d6e0543e57034cddfcb2780e5f849a8d61677. 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/TCAHR2333184.