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 0xfc221449b38d30001b12b6d1d285885b9d77e62031a7b07a26483b6950785948. 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/a4e5f25e-6b82-4f56-9055-00e76f423fe1.json and https://artists.proofprofile.net/proofs/artist/a4e5f25e-6b82-4f56-9055-00e76f423fe1.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 0xcaee730715205055d2cc18adaf5289204acfbccd2d91a3a1bc253172dc9c0b71. 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/QZHN51949475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5a153bb20b4d28333eac18ff634854497f267e9745989c05bcb98e0723ec3e. 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/QZFZ52014602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e2ba280d4b68fcff9cec2b215116f38e118c130b7c34ffa38f563aa9dfb5eb9. 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/QZARB1868093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98063c535d692b377d950d7973dfd09e1ed825c6ab8f78e6efba899fd73f53bb. 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/QZDA51865910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a4c40f6427d944d6ffb2e0504430b185dba972f10d535e709cda10f7f7970d. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZNWX2098421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdeb157f848bb5150cf4b9300feddd3e582beb8a5de9ac1ceea5fa3899c5c858. 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/QZES52153257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea3e46dd4f583608245a528f686aaca03e49331cc49369b1bfb5c5445b06515. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZK6P2193855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f64e5305e24179fdd983f52ec088850330467a471a3a5b5367074229e12caa. 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/QZRP42153939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa07f8caa2ec04d07fb297a325fa6595ab7543fc256ba7ad4f33cc0f7830d2c02. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES92272763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4357c70e34ea2286af37859e59f70eeb344cd309fbc5eca56983fee71417a4f2. 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/QZMEM2204212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x257c9458a7b876361dfe1e910171a2f2b49cf2835bc9b6cddce4c8c7f0ae3ded. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T02:04:09Z), 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/QZES92488344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38d0febf7667daa1b5e9e3076da76138672ec192cf5950d931a20503f8e511a2. 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/QZTAY2456558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x626c539855178785c8629f1b8579905cfbfea906ab447556d4b7924625d29656. 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/QZWFW2433669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b832b4023b36a5944acb7cbc770ab533c8ba255d05621ffad4eb6bb1ea7b5a4. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T20:36:46Z), 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/QZZ7M2439570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0fa80fcf5126c0dcdd00ea964e280afc2e06bc76969f5804b12241dbb69e47. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:51:22Z), 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/QZFZ42539511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e08f360e212db90c070700cf9db85b69980144d16d60d69a27e59cc61f584e. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZK6H2533460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc277f05c2f8eb8204dcc633ccdf80af1e7a82989fd6de66a2b529fcd66a28dd3. 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/QZZ7L2547237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27517b8762f66685d8399b6220b2dd4de9ee5a2f4d38c687b1bfff4b62bcb902. 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/QT3F22540942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb0b91a0494eea53ee7d00de8337de3c50ea8426f1f7407590fd7e39d27108a. 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/QT3F52562619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e07d8880701d2a5458b234f44e576d15ef9f370bd9d730b5b291c26296eb0a0. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QT3F62596536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6ae25d52f863db40aea7f5f2ca5ef427efb7a3df39581cd4de74ceb857bad9f. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QT3FA2543829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84d40dfa54bd66167500d88a790f9e3806010ff6b08ff989f1af692bd9a3756e. 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/QT3FG2522933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd089cc83658381121c2efe5a35381df8464e1544b326f367317861db81cf8f22. 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/QT3FG2572734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89004cc9c8a48ffce77c35a2105d3b9c2124e408406c281163847ab20e33a64e. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/QT3FH2507615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76bea44b4c628ec0bd3d28d7f93c4f6ce06995b399a80e27d41fd4d1faddd62. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QT6E62505249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca7c11934e86ab9c2887828cac143a4ded96d71e0d6804818229d4fb9592e2f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QT6E72531725.