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 0x94e37d667f6da149a1dc8fe324e251851c822dcb7a86bb2b2bd69716d1df293b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f947899-9962-40d1-a9af-1273cdd5e9fc.json and https://artists.proofprofile.net/proofs/artist/8f947899-9962-40d1-a9af-1273cdd5e9fc.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 0x2d8783c62ca9e96104845e7a0c7a5bbce456fe135a13037382b5c5fcce7e58db. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HUA611701052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43144950c30f9f68a5c80a5d800dd495aa6ab9a4a965f356a0cc63d9d94fa09d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HUA611701053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe8e629252e6649b54ef6c6561ecb1ba9d7810ea916bea19cd3059bb9f07db7. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/HUA611701054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d0a8497ae9a34972b30e14dd012ab4808c691650adcad520c489656f2c0697. 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/HUA611701055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f09093467d32b3e8894ff72514eb0c506409201915b34c19e75bf4209c965b7. 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/HUA611701056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60adf15332e498b87b807ebb4c50007d3133cb4c0a565bb69774f84f6b9c3f3c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/HUA611701057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb4ab931ab30be5e42bddd7ed1aebe44f78a68a924089d38a85ca95ea4c91de. 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/HUA611701058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d1f3095cb7dc88e7682a34947a108772f434299f68c1d535c67edfff6104be9. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/HUA611701059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4e0322d747183d74a4296dff996cd2c0a1265357983b859019a56b8971c35a9. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HUA611701060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca54251c7653b00a66f56e0323bc67d24e3dd6a7edd7e6eb918e74b992fc3586. 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/HUA611701061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12abb98160372cf435c06c3c2d256256d36203c0f0e19435c96a3f265c51c32a. 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/HUA611701062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3f557b3e63071f828fc48d4e95f095b17ef7709f071b823551c54bdb18a4d98. 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/HUA611701063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2b563f1c849abaa058c2c43d27fac4a16ff4a6f2a778993e8890acd878bd31a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/HUA611701064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1fdb53cdf38286d87f00193c4e31cf9953bdc5840dcb1eb291247d36a09413. 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/HUA611701065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572046cb8842bb9ae5b313a3703041885a04971bee59f10e182b18d29380d581. 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/HUA611701066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53a11443401565dcb8c98538ddb16b3923ca8d8f9bec8c00706459e203cf15e. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/HUA611701067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b4d4d66667bd656cd3ddbff6a813199cb637b11d73f329cdcfcdfd988f37f7. 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/HUA611701069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fec50b1818e4b9ac14f20b6a2edfcdaac9c03d48da62dd0d1370b64c25d6b87. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/HUA611701070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9bbd1c560c9857fa71909571e71fd559b3138a08dbc87cdc983dd0be1a7e817. 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/HUA612404617.