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 0x9a719dc494fb881d8ac950ff2c8db40de983ceb77611332d927d9572ad47a7f0. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e39a83d3-ac0e-4656-87bb-19bcd7ba8b19.json and https://artists.proofprofile.net/proofs/artist/e39a83d3-ac0e-4656-87bb-19bcd7ba8b19.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 0xdc9004dc04817411e6b5c24d433da6592fcbce1177bf2c96c726884990b53ad0. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/BCVK92400134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a2574c4d16437baca1752cd5ba98af688e133740ae41e194c58402d2a21bb51. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BKVH52400152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a3e1e4eda0e605cf1b08bff3f467f8c52ad5e70e69c225895a517625f7a0a9e. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BKVH52400153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc855f6b1b692f949694df107f21bb5dec6f0090b9f41739d1f0171528dc22e10. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BKVH52400154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195bd5f13fe29fa4949c3ea4e54bfb0fcc2688e90993c675f9a2356ec83765a6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BKVH52400156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3fb1846385d693f96bc4279622e5b929f0d5ca85603aa5c0f194cded43d617. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BKVH52400157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7694cef30d295c7512a902e9662c89cc52947d96dd5210f5a48bf47cb417fbf. 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/BKVH52400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x816ab9ee0b05638de1989e0e8177105ea524a822d2082806661796439dc8051c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BKVH52400163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a183869bff3ebf14e8fb6d050337582ea7d386882938602666407545cf5db4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BKVH52400164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f926ae1f3628a16f5193ca6c31375cb7be766e375a7b24d59dc18ef1ac28354. 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/BKVH52400167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffce4cf0cf7965e6a44835aacc62ca314e06f613093e7cd9ad9201f41519d389. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/BKVH52400168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5779ce636767bdab3761e9ad4855e621f068def3feb86caabaa3e42f9a201b6d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/BKVH52400173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c975d1a56ba883920168fdc087710dadc8bd899205e4dfb1927061fd393d234. 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/BKVH52300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb984b691e7a2ddec4aaeecab6701fc6f7f7c40021c4439186fd6341bd5da83ed. 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/BKVH52300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0a59fffc270bc5fa5fa8a1657ee469b86d0360fa809b75b6f7e320eef42d39. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BKVH52300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c1b8194d04992381445f13a2f84dfb6879a4c8eb185d0dccee08913d55cadb. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BKVH52300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38aa1304518b3aa7e5976dca62b18753e63d333eabaf02139e4d102f301c92c4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BKVH52300019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e20fec65d41c6eb68473c5f6db2f7ec18c3b0acba812c8a5af1681d534fef00. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKVH52300020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe385937a72cc0f66f30696e5d8f66c0d9a0a666484520f7d40c34ef1322922f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZMZ92433468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b6b292ab194a8a410d0c678cdcb7e6f2bcb164716c51836783a193a50d5dda. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BKVH52400011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e58b484369bb0c9980d4f74036c70985599f7ff7b7445d8dbc882ea2407a374. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/ESA112315825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe425926470df77dd183f29ade8978427da3530b8ad6b48d7a8232018cde7fb06. 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/BCVK92302384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3c6278c002857c5e3cc039685fe14b12319a716033f1647efdf80cf0a1cb71e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/US7VG2481120.