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 0xe288efa13e303a73a2d2412ec898b3962ccfeafa3d685ceed0dfe2873e35e554. 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/3fdcc7bb-db8d-44a8-b0e1-2201923c09b5.json and https://artists.proofprofile.net/proofs/artist/3fdcc7bb-db8d-44a8-b0e1-2201923c09b5.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 0x0723d8dfc2c6a7c772c1abc228f5a0aa94462d3c6b9ad620f0ea82adc818415f. 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/GBWUL2388145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5c096621c81ed33edf6a2fa4c5355784a076c61eecbf26fea500ed9bd132bd. 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/QZWDE2434221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fc6fd0338cd14665d629b89ccb84a8e482f5fbd9b880c33e547613eafde8ec. 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/BXUO62400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa50f3d9fa655b80f3cc84abb110d54834f4357410d4bb5dc44db34ade6ee5f6. 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/QZ5FN2417757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b45340e17b597e2d15b85b4b7eb2f4c2f3f746449e28b9ef6f08c618b3a3bc7. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BCZ0E2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0eb2656cc337b273fbb29249307c85bc07ac6d9a55a415dffa57c185a3d2e5c. 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/BXZYA2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9ace646c333d616d86a34ba1216faee150d7562c5aa65a33e6d90ca180f492. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/BCZ0E2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ef1ff1a8cebbe8b765bfb90a20563019cab61710d6e8ffc7fea362982b33c1. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/BXIV82320441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c2c25d750c4509030e68842f9b049d2c1a9a93ecc4cb73cac1db6adbb9c435. 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/BCZ0E2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c245756472ab9b19a73699c9f6c02ddeeec64e1b6be816316677ec0c81ef5c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US7VG2314398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ab723056d635e398c12ff675ae6af616098c3c0fe9a29637f06da3a3beb5be. 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/QZW9M2203926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f9264b2bf6a11a687e302c1e16b8e0ceed5db9bf0fc3c1f734f1baacfe438f. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/QZW9L2232426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7e66f578ad361f8a40eefd21bffb6d636804a0d141397eaafc317282ba47f02. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BCZ0E2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc76e3efe732d77e574f53a3301d6237152ea232a3fe90c957f24ea8326003af. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZWDE2432798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1219facbaac697a600a0ffefa79185179896b1c698e91100146a236e16943458. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BXIV82349118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc4750285ff29311e1b6646f4330a37438eb8c006232073e47d15854bcd8bbd7. 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/BXIV82397325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8b1ccbea108022759334d5b10c4c92324bfce8bf807d4e7995a5a76070b0c5f. 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/BXZYA2300034.