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 0x00fb3798d26679a143aa6bcb3491b900887bd0a46a4c3505f8048de77e6b4ba5. 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/c8bc4fc6-4b16-4f25-a16b-2d1faed3cdf4.json and https://artists.proofprofile.net/proofs/artist/c8bc4fc6-4b16-4f25-a16b-2d1faed3cdf4.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 0x3816b4522225e7c10e9adb88d3ce424125f7bfc1ef1a7a473c51ab01d7ec7c62. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/INO132001703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505eb49ccf0d8e3d068dfb1a17d7594df83848af619b8ab727bcda9645c21acb. 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/INUM72400863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd39e6a692b3b180027738d3d10936d0be523a0e05961632d6ed8dec8d9efefb3. 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/INUM72400585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a631259adaa9fad47528c9cc0116af848cfa63535ef8fd2ac65350a1c79da93. 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/INUM72400451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7ae5a45494918976f799343bd3f91b484a9037b84922c2fa196ed49d72967c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INUM72400271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ccf8c930c6df09f9690fe85449d1b5308fe6b4aa4178d5a74d51ea9764174b. 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/INUM72400101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe672de49eb4b740feb49525b6ec47e2e35710565b1c9a8e087dfa9c294a98086. 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/INUM72400058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f6489d5daf6a95c5825350fd3313a2e2e0aefec897b23dd8bef1290839e6eb. 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/INUM72303157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8399a9b8d2eabedc197bacd92ccabab87a8c67440875e7458e505fb2488f648. 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/INUM72302909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e454224cca2490663c5f3a4c59e9ccd4cbf4a97d761121471d561e13b419cb1. 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/INUM72302532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf654178f6de187d4dbb47e1a5f0690c4067fa710499cf064b9f757652d24c625. 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/SE6XX2230945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c96149a3c653614804470db4cb99b1bd4cfa249c1144549ce0ceea3d7fc73e. 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/INO132101651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc563a2485dc3abe9534041d151e768ced78f60bef536132b27e8889fde33f9. 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/INO132103726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f5a1fec41f654a501716817fa9aecb0d16db83b17cbaca340483f170f6c371. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/INO132103683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8264d0ca01f47911849a91174466bb1da96ee1324f16e9b0b58d4fbf4c80509. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INO132103011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcee774b030fae8db2e6efa6d84c1dec94b80a32f101b07ca89b5bb17c57cca35. 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/INO132001251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970807e928f7e9a352f414f6b300beca11a91f4260ed14d47212281f16e8a537. 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/INO132000577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a68b926a42ee1680076cbfa09827664f2742a96bf6a7aaa4523b7a10f72d15c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/INO132004005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0403e9b452f3c5294f4885a47ad1f8ee086190150cc90dabed229a450dcb7dbc. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GB8X82401781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ed5f980cf9c0564b6e635a8dac6d0e66fe319ba2fd676e3ddc49fc4cd38438. 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/GB8X82401782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170af9b7cef0aed41f0e8079b64e21eb20a4a0011a8e51de23716ef5ce0f19c4. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/GB8X82401783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaafc3bcaa446f9db8800ac870b49e9ef14c9aa456d65332a8036d60326f9f81. 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/GB8X82401785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73a4f6911b44305ddf43508984b8240000be36c739de99a9237d7ed09f57abe9. 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/GB8X82401790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b6eb725eedce154ccf397a23a605487f24923937fb63a45fd04992ac1df087. 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/INR1L2100131.