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 0x735b22320846749dac23a8b0c9d824b9009ac164690fc7ad47dbd3a74050d410. 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/e47d5270-3e62-4ca2-9cbf-455913631b53.json and https://artists.proofprofile.net/proofs/artist/e47d5270-3e62-4ca2-9cbf-455913631b53.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 0xb69997725cca190e2b843e63f54b858fc3ebba27dfa354862fc0b69f0d9e5843. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/MXF149800129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf38d6de90828f789ae6bb2f27a27bcd8495cff99f1d0cffde08aace25f89a8c6. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/MXF149800131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa57f8d1ad9d9b0ea605bb0ccd4ae5d94875b137d2f1763a69fed243d7cba7884. 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/MXF149800132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec3c744af0e665f2ab897bec709db182d2dea5c1434a0834dfb1d518c9b7d2d. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/MXF149800134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea98d05f3dfcdf4705965792633c6c66d282618f3efa0636ee5889bef240519. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/MXF149800137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9781ab7e5f99df786ad3497b9ed190178e925658c1ad17ee923f6e725fb34d4. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USASN0801649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705a6c1d0ed5f77c6433d9ea7f24c526f9674c0e32523c85150eac22572884bb. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USASN0801651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ace7a4ddf34618986587530704723f3b05dd1123b67c65a4e1ead016ed7e49. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/USASN0801655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d290dfd17b1d12f93649ce1ccbe2d6cd3ad39d38c945f95798a8d421c9750f. 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/USASN0801659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7167798f9d5144f3b887f5595374f583e9ea1d5240d00cb8d8c58cd7d76e273e. 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/USZBG1117406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f33714db7425ac12e32974f7d539f7fc2f7f8cb8cda2bd2ba00ad4bb92f19fc. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/USZBG1117407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7261767345d98fae46a5ed1629513ee8b0cf03ba389e73aac67d53a118fd4fc0. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/USZBG1117413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6aba5cfc16a1757901ed106df2730d4302d90306e26810731390e6f7da2d2f6. 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/USZBG1117414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3318d3daeefbc2e59201f47fc74f2a09dd78bc6d14fd79cdded888ae0f49fe4d. 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/QZ7361900228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c3de8d1491341edc7881c645784e2d23a3ec59d27765bba550eec3d035e471. 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/QZ7361900235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837fff5bb5450486b9891e400447d15aa8f3167776cf03da0b69cf603b4282da. 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/QMFME2107226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd12d659e43b947a961df6184d9180938b851e2a1a73e9b98f93706938a2c79de. 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/QMFME2107231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f62028a7f77a022c0afbdccd101c986624ec4370b334f6ac664f0cf15aba388. 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/QMFME2107236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a1b564611da48973f217d0486d07d931204b6ba88aed6cfd3f668a6804179d. 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/QMFME2107240.