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 0x94174cc6ef88810aaecf49a1c568bb02f54ab32b568846996d5f9eacfaa6688c. 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/4e01d841-970d-4394-b9fb-29a1e2b6540e.json and https://artists.proofprofile.net/proofs/artist/4e01d841-970d-4394-b9fb-29a1e2b6540e.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 0x24e5f47a763f14647b4cf335e8240cee14b3013806301cb2183a1626a6eb8450. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/TCJPA2452583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31f92b043ad7a2f3917b2587c3e579bb240e3baecb7b5f69b6b1d7b0df4161ed. 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/TCJPY2362387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cf48f686496b9c641fa07737c1029fe2dc5ad63e72fd7346029d15202907ac. 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/TCJPY2362423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd307a48fa1bda670df204775fa157c720a5922346b16f17f6167cf4b2a44af95. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPY2362446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e7ab8d00b76f82e2bc337631e4527b48312554e4da4c67a2cb1c8de986209a. 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/TCJPY2362463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ce5a9105ba33773e7f2bed0528c6341f409fa780f58ae99057365b815d514a. 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/TCJPY2362504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ed728f2d1a797c87c22ec846a4b2347f913662bc56a89ca03868e179cc603a. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/TCJPY2362531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9fbb664e5b1f343629ca6df935cc5a545a519f08d8636f6527ec95350bb0df4. 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/TCJPY2362831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe89ebd8e4cf8a3a062f345d67f0b984a23d0ca23f984dea3ce8acdf6f7fb607c. 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/TCJPB2474836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051e7ce8b7287a08b5e226cf56a5983c9697ed0bfea4f7ba48a06176c120d0f3. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/TCJPB2474838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715e3cfa1099e06f034c14409ddc977939555a31c3a1d86f15cd6669f572a258. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/TCJPB2429319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70f7f93948d7634fc9b7e091f49f5b6396fb0a7ed36ffd13e728d869267e11d7. 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/JP92N2433717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd45663f55a104884b1d7c0d6cb920fdc6a7d2c4f0f7f3020a74bf8cc5ca677c. 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/JP92N2432707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ef6d6c3a1aa122932b2a648c1bacdd6aadadeb68b4e10ed808d79c2d4a0ead. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPZ2483821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd04c9c1e72a8cc5e1e04968007e207e3a4b0d59c7e9ff066bb79e54e924f9c4b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPZ2449223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c8bde857efe214f95ae879c449fd354b37927a5ff7ad251e405f3f0524c9e3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPX2395519.