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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26ecab013455b2051c8b9b493a92242b1555c9a8d99efcb187094c8a21f77b3. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a72fd44-878e-4f14-bb8c-da2e1b4db0d2.json and https://artists.proofprofile.net/proofs/artist/3a72fd44-878e-4f14-bb8c-da2e1b4db0d2.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37889d4ee62cc1bc0b68c06b0972115780234af55d7190e2ce9dd7a1ddb23ea8. 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/ES7031105601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e87a40ceeb97aa8b3cd6fcfb5e0a816bc93bbf8e9a9f2d99db5e4c6d007727d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ES7031105602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2187af1da9cde70b4a7d21f880b89878202b2f28dbfce93c7d39de0348feed3c. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ES7031105607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca1b31688069c0a681e382786667c7ea9d4dcac7dab57c7c2d30ee4e8e29975. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ES7031105608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73bf3ba84c7d3fa97249da648bf6662313749ceec47107a4d5c89e0fefafc2c. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/ES7031105603.
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 0xa974af95ab2f1b11b19dc979cff5980fa6bfa9b9ef59deb588062e02121d053e. 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/ES7031105604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4d55004a0cec8ca23cbd283ac3074316534429820b3d4d6abbdf93b4791c98. 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/ES7031105605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33865f9490365aa5ecf955eb169a487d3fd92f6191c5afd13cdb49f4d182a40. Chain 2 (Bitcoin): anchored in block 960230 (2026-07-30T08:32:18Z), 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/ES7031105606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46afb578ef21bb540664d00ca5aa7192e9742aa901ec1f764693c2b064acb522. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/ES7031105609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ab6f127bc58afa23bae6ee50a41da896dbd8843d69a1851ab90ecd2c751c17f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES7030925201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fd62796c9cf6a4fc80dc25af87018268ce6bb85fb7311996dab6f921e054126. 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/ES7030925202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f061c1fd078bf15ddc9a00b8c2f77f8a471c2e59a408fb6ab23d98f377d7179. 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/ES7030925205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8012765305149039352b3d3f601e00b23998a3ae2b9c3d5a4cd06e9fbc0d1c83. 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/ES7030925209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a53983072b339f0a5a8f57ac8682b66103b33744557bf3c38a4f017db2b53df. 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/ES7030925210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c8b6f30ecf91aa17fbac4351e3a24a11f3ed97c845ad572de23edaa6d6e945. 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/ES7030925203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f7ea655d580980076a0fbde6eea93df859b614aa4d8b07069a689e918b50c5. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/ES7030925204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97f59519620fd81f2da098b86d745203f9f5014846c7d93f581ff740d71e46f. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/ES7030925206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbd96be8e2fc1a824de8ecde1e0344d9bed01ac7a874916b94ea0d668f96843. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES7030925207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3d88d8c0ad950cc6960e5cfb01d15d199141be90b035c5fdea5fd29af48cd3. 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/ES7030925208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd329d9205aba8a18c983a59dfbb35d9f1ee7fadd51cf702cc0fb065ab457357. 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/ES7030925211.