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 0x7e97f1aa384ade26b8d579c9c903ab40dfebac6108915089df37d1b9d4001b3f. 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/a4a00199-d8c6-4205-8f5b-ac272a815d66.json and https://artists.proofprofile.net/proofs/artist/a4a00199-d8c6-4205-8f5b-ac272a815d66.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 0xf4a7c9315973ccd42b7e0615c1506a73c8ce5547976f263ad1037536941f6b74. 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/CACWV2046192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9438313aa4b77731c1166d0b6c1491b2eb13f03a013c31f28c3a2393848460b5. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZK6Q2236589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b4ae5c27330e007a44c9d5289fa17e1ad2aa82c03f5e94f4d32abc458774fd. 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/QZMER2252220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655a3e363053efca17d10b1848ff4b98b612978972d7680983e5e8707c5fd100. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWZ2284372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a655126d7e29d8a081d7a1ad01fa734c60d95b49ce21cea7bc7097ca08505f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAT2235981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c67a5ecc9a611c982f5266c3a80dd8c1ac1ebfa1a8b01d500da5ba16dcfc9c5. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZHN82388437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bdd0736d17d0c258e4a5477b16aee992dd3123b2c8350a02aec997b8cd6eb32. 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/QZHN82388439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7babcbfd8c6237b1a30bb9a74f15621284425f4555310fbe09d9be3890a8771d. 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/QZHN82388441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f86d91184e5434fd956d7a81f9e309a66e5c0a872cb5d6bc95b0f186bffe85. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN82388442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc519f55170fff31ab5461e0b272ecb7f23d49696979967c0c2771ec8a2006ac3. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN82388443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46dc137f62a2680910e8194e1e9bd658f93c4e762bdff79ab7195f1f09526557. 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/QZHN82388444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28a42e23143671965381584be3ad7113f93681c8d276eb1ec1a4a98d11ae150. 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/QZFYZ2366286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477bea1a320b8bcca7f55045b7e7ed07b26a3c3b9e185b26f1daee0c52148fc5. 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/QZHN82388445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a3960c20c7d804955cf8316d8b36f93b91a1b7bf9d5f86792a9af065f52483. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZWFF2483980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83308efeec7e5146409d957452a9b379763d8bbc91f7b0653dcfb3716174a779. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZWFF2483981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7a48138fc364de3870e2d07a47f69d09c7f31818c0a154e34ddfcc4e8e1bde. 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/QZWFF2483982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c33b76a01d30424e4c077349debb41c9900166055d6809ab0674566e2401d66. 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/QZWFF2483983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fd0f4e60bb44c001e44f03587fce00194a67cabf1027a00a4e4613d2f2fdba. 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/QZWFF2483984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d054643742cd8b96edc48580317ab599226fd4442b940d7c25a01c73e1bcaa. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZWFF2483986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1222988d65b535f2a79289328f420e4195ad5c82b6efae6e13f2109f67f883. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZWFF2483987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0c7629ddd95ef0d2b0cc70644f0953b4aa17043fb083dbbf4e876f0997c7824. 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/QZWFF2483988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f0bd9fc7b098789b7b1b3c780105949a3a06ff35fe9c7db797239eddc5be1c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAJO2553326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad86ebfbca7c86e198d99448a316a51d891e90ecc17dde952bd63c748242080d. 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/QZHN71971834.