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 0xad347744ddcdb483170159bf7df3eaecb53a9000def827dd32ddc10c6df1d578. 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/083dd8ee-243b-4ca4-8ddf-0e7364ffe1cf.json and https://artists.proofprofile.net/proofs/artist/083dd8ee-243b-4ca4-8ddf-0e7364ffe1cf.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 0x60365b6430a8a1385827d8659d8ccd213f3775e566808d08312144693db8be2e. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZ5AB1783212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a904ef2324ffc918178ad2efbce7feb42f52bd2ce00627ac662e198d553be88. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QZ5AB1783213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2acd2f191ad51d4b5ae8ae395398d4224789f3ec2f7fdbf14ac6b1934221f3f2. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZ5AB1783214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e3e957517539265f188360b226020bb6a54a20c847e5627e9ab80092ce63d8. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZ5AB1783216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5692c7a31ceef06c1ad77fe596cea83ecf2ef26cc1100e3e9e23d8ca5198e60. 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/QZ5AB1783217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17e565f4472c06427222d96b7ee73db3ce88225337b30883109df4e9ba7be001. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZ5AB1783219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78870b79f668cc4be36e5b936ed2e929261f2a1063eab3559b51d405dddcf379. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZ5AB1783222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05144ed80bc9d0af425dcf34cf5481cd7416c361674faa2e080d415a2d54c9d6. 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/QZF8D2500771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7077fb37aea3a60e3a1f92bf5aece13d19aeaebcd9260cfaf49e5907d3bd0cd. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QZF8D2500773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c3b39e7062633dc7d23f4f70f6db382221b9919e42517352993ed8b2c8944a. 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/QZF8D2500776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb9b9dc6ede6beb0cc0491e630208d19944c19201decfd7b3846963682fbbfa. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/QZW9M2406009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab94db11c89683e98e958ab9c05c1014e94b3bf71079a13d1d1516e5bfb94d37. 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/FRX201725722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5854773593b835067aa79c4df25a660f4e413beafcf207bd8b7fb3c8dbeb7170. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/FRX201725725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ac357de783ac10a3b42cd7e43277b7a822f73d29ab58c8dcc385d1353783e8. 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/BXP1A1900606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f00ebfc336c5669a7f8900a2e9ad0a8c3e5fbf723dddbe3ea407ed9b34f973. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US7VG2160926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312a3e98725b3a798cac47ace54baca0f9070ad4df8fd7989bbfe2beba9a84b4. 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/QZGLM2165489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6e8f5adbd818a6c96fec84047edf28d801a2a5f6a0c681fa82b077b835ee22. 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/QZGLM2195484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7542f0d6264e49f634f8dc2cfd39ea1b70f192b38df926d7f4f666e0d587fd. 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/QZGLS2132745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda0c8d8034224654b7a8d20a7219cc5447930505bc47a65c6e58a04edd40069. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHZ52268666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3edc3b2a0828fd03f472709f45db8eb77fc4b1725b5692f6320d7cac1fc7a2d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CAQOI2410242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078048d5b2ece3765b049b6a8f45abcc433725e034ede2595517a7c16ffa9fea. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CAQOI2410244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d8a217a5d8ed503112a2ab8c4d6150f2947a3db844b4edc20d8a308c5a550f. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/CAQOI2410248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9cd0850ec9abb4bdb4ed6b3aceca6c4a7b01814ac60e66497e3e13de1a73f7. 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/CAQOI2410250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f74d69a406b3fd3a04fe8b5a8648e874e53c0dd89751f513f894ac6de072402. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/CAQOI2410251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x091e87787fc33071d32837fb721120b0947b88a2543e885e1be7a24cba971970. 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/BRLSR0301647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c655fe97eb48247bbab0789a4f240a5245d4895e286b8e4d7a1fdcb1fde279a. 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/BR1OC1600391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5944abac11259bf49624f1ac49ba2f7625aecc469f4ee9c690929cc92d3ac2. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRJLS1000016.