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 0x585fa13d44f4687e5c05ec9327bc0e53b747183783e2edc2cdf7abeb55218b6f. 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/b2d62976-240e-4cc7-905c-96406cb9900f.json and https://artists.proofprofile.net/proofs/artist/b2d62976-240e-4cc7-905c-96406cb9900f.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 0xb0206f0b639c6d3ccf1bffb660f1d245cbd7d09b55c1a5394cbdc442a32bcf22. 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/QZHNB2098288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f86ad0d6ba12f56d1e107f58424b26a1259a88d302ae0134faa531cc5c9fc53. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZNWQ2026932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2acab95fa401a29c85b063c5718dbf3630265dd6c0f5fddc5909050a2a71c74. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZNWQ2026933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb75aa9deb421bc98d0a0b20ac13b7ab03057a04ef034ee7830803841b95a90b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZFZ42115408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd2ccc0a8848f29effdba8cac67a3d7a8b7e50eaa8926bd6f977e86adde2f38. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/QZFZ42115416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaacd512ead17e00de2064b8874aa282aaa044586768439d42302dbb787ed08df. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHN42193030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2fc09205220b9c19d6e576bab9b4c3c7ef5828d54e18ed783bfffdf4843b122. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZHN42193036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4672e770d9542deaf43e57ddc18808d9b3f82aa2e4be543a8b1d3667a8dbdecd. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZNWV2195395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f0d5949ecaf9cafcad3e6b2702927dfc29da9f06cc8d153335b50b2a04cf3b. Chain 2 (Bitcoin): anchored in block 958827 (2026-07-20T05:07:11Z), 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/QZTAU2165079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a3bf4f13626c9585584fe02957f9bfed14883cb8d9139c726dfa994c6947397. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/QZES52275336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f22f4e89cb400b414123d4a04e59be75ccd4977eb6a2d78c826587d6c8651a1. 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/QZHN82216973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf2720816a3769ef7596f8b1fd3b9691744076916cc3639a3a97b3f20967181. 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/QZK6K2291488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe5c409d2701ec069c60e5341c11e53260efc8abe473212b3677234e047e458. 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/QZPLS2209918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b00d46fa1b1724cc89afcc545b848f71e350a5572badec00b062399d41048b. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZPLS2209921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931065fd7175c365d1c2c4f276fb8d598a5c02e2716a63dfadc5eb1f1630eb1a. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZPLS2209926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832a93ff521894c5263db216be161c3a10ad799724fda0131fe42463dcc0ccc2. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/QZK6Q2305538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5b7882dcc4eac9a27e3c28499b9baef9106ee0296c5c239ddc5e5a90cb87955. 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/QZWFN2321133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5cc6f5d6ec5b87a876609571b66a9c55c8a0abe0acb94919388dfba9156093. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZWFN2321137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e00104c8319522c5c5cfb75db7b43b6994b159c064d9f9fc04e004fb4da465. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZHN42453808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348b9c214b3c2e25f9b9c1fc8971689287e81f5d0827480ee6751d46b6b86a3b. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZTBE2419710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0668b67c8529e9d6a550b188b98be88915fe008cf5c54681a7af968d28d9f33. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZZ7T2452222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d4ee518bee8a2cdd9687df5ac837336d01491007b8a9963632b8458afed239. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/QZZ7K2524560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb961c8fc5974c88355d4cb737ebe96eae41622640fe3384482c5a233f7a10b5. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/QZK6L2241890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33eac9ba7f3ca9ad0d61eb36ff49a9f07a04fe0457ba98d3c1ef3aa4030434b4. 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/QZWFQ2356174.