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 0x34fa071336d34725f6f6e3d43495ac0a7968346b521bba3ad35b6a15ce257c6f. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d8482e6-0f16-4807-9156-068f4c0ac233.json and https://artists.proofprofile.net/proofs/artist/2d8482e6-0f16-4807-9156-068f4c0ac233.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 0xf2cc61785dfb1f29a280ca8345404880f33d1ada1c82b0d3de86ca36ef6a6d04. 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/FR6V81706771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924accd6d979cba519d5887d024ea0055c0019dec4003bb402eddee348224fde. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR6V81706780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09db3210a993b114073d61445f6094e7b3b707837042bb6546c932b8b38f1ae2. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FR6V81706783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d043e84b6cace857dc98ba177fd5d67e289585923d2ea9506b05b4664f5ab9. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FR6V81706785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd364d833d4e7ecabdb16db5b231a2a7ad7e7d42229b63a6b050d7f67da898a70. 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/FR6V81706793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64a0d23e2d50483fa5a32d033ccad6469f5d449b34b6d5b0261ccc6d1a422a6. 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/FR6V81706797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d73ebe09531a13fffedced2b1f949f7aa7484bd1334edc88370e15d1f3b501. 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/FR6V81706799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8ed9e684af2de95e64ab83513098464f8c75848c397e362651f8a394470ecab. 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/FR6V81706805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaceba40e44378ae4d6800ae1bd9c19702681da1b1937b939d84737ebacb109b9. 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/FR6V81706812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd492d476236da726598d3cf7979082869080c4445e74a68d05539745108aec65. 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/TR2160600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f5d5903fdb66d7101db6e6e39e74ca2b6b37b64f4696ac148f08421d01b801. 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/TR2160600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf86b828b6c9b8afdedeaa4f1c261aed87ec587b41b5cbe9251f9c8076f433526. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/TR2160600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7fcf91edd5615418cfbb8f03a1d74a0bfe9dcb546aab5d83b97247812319adc. 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/TR2160600007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff23d461322346737a90c9e9a944b3b09279c9ccbe9c028d328fdf4f779d3c2d. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/TR2160600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c36a6cf08847450502f571569338c7f3096f0e6c259cf4efead405f9a7d493. 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/TR2160600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73618ed23cbfd7b00dbaf121725497a9fb9d7f1036f90e8a683ec834a120041c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TR2160600019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4501714f40bbe532db1417736f1b5ecdeb1be3630b8045c29b17dc7068cfa9c. 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/TR2160600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84c9cc6a4d461ab43da54eef1be2a93f6f222963c2de483e31233ef16bf704f. 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/TR2160600024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd09efbba721bba086c3dfa16f851fccf95d1a9e0d2a0260362be596b3bde25. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QM4TW2013270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11800c7e45f147d6400bb02dba8c42c9e2bc2da18e8f632648287b8993f952d4. 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/TR0282406955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcf81ffff6d0dde93278fc0d013c52deedd58df521df06e1c78a2ffceb70074. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TR0281405247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71642ae29122841aa5a14b58fe9d4708a0da5d5cc7c248deeaf7e7b7c146af2d. 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/TR0281405248.