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 0xa33f78cec93d9523258c23204d2018936303906172de69d9538b89fc5d88e907. 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/03c563f1-a4f8-4a5f-8816-13cb180c5954.json and https://artists.proofprofile.net/proofs/artist/03c563f1-a4f8-4a5f-8816-13cb180c5954.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 0x06c74cb2a7fda13e85881f22d322cbacc7eebda0426c962140f6c322a5fb6f2b. Chain 2 (Bitcoin): anchored in block 958708 (2026-07-19T09:08:25Z), 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/USDHM1717683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d40d73cd042d5007b6bb743939e7847254ae26d5da7bc604f740cdc09dc0f5. 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/USDHM1904276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b516d63c2039064af34dbfdbed75d0636a3b462ed8ed1a16b98045f7217abef. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T10:01:54Z), 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/USDHM1907675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286badf6a710b8928237c4b0adcc330213d925a5253d4ab618553abf37c89e22. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USDHM1907677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe611646e9c68e122f0818b9467c1120f215a5338103f538a0dc08f56e5260a31. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/USDHM2017163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8b571ba716e6f6e099c435ef241aa067f89fb4fe2ae16d8ea3c89b5ae699dd. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/USDHM2022563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b5ee406db598c2c95a7438b1fdcdeadaa494a6622a9e292f62f8e2ccfbb512. 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/QZK6H2142466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2cb1e8cc63a2a8489357a90e81f712142c57423ad485a804be28e8567240636. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZTB42273817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342207e6b6f6586f1023193c1ddffbde25d3a58329c4d545ce881e250ab73cc7. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZTB42273818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76878751722c726a54e9a02c72e8a5604cb607158c6de76ca35696183f0a2070. 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/QZTB42273821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d19669bc0e6f1aa52eecf25d49ae82b2eb05dc68514899b7ad9db7020db9a8b. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/QZTB42273822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd895c5778f6fc8a8c3b8d0d0522e131d25da63853d0d528dfe05429ad84fb8af. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:18:09Z), 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/QZTB42273825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5a35885359740c29fe315304bd11b2b46658c00268c2f06ff42b16bc58b0439. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T10:34:36Z), 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/QZTB42273826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb6ff9373bafa4cda4cf10aa85ef1dc58559d808d10f5dc3204a2e00c101bc2. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZES62367383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0177071300ec2962bb16b84a36525900f0f30e63fb15e19df6f2a2c86941e3bc. 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/QZES62367385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcece120e82802fb29f2f23e880f5ad0f589b29b2e703a5f4cb11b4d2e4da298f. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:51:27Z), 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/QZTAU2346051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e293208b35d1680f9e5915f91cc071d27a8baf520c87b6e325e2e9066802ef7. 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/QZTAU2346054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4162fc95ad52fc2a9601e823b69a86d325dfbd984d66885791a893fc14c64fe. 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/QZWFJ2482415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49c2cfdd637e305f8b14c0df46da5cd73a1ec73db08cb4ca0b3ee94509ca27b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZNWW2395923.