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 0xd66942b9c1ecf1bce7017f56860d18265bfef1190fceb0f99774386e133b7035. 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/571c0723-7e8f-42eb-898c-0b212c2ac282.json and https://artists.proofprofile.net/proofs/artist/571c0723-7e8f-42eb-898c-0b212c2ac282.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 0xa48097d2808847ae89a9bafb30d7e4024a3fb85284f3e896c6e7e0266ed2c790. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM4DW1607795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x332205f7070f3180aa4e2dc1107914cc9c760bab65a80815f4413dcc4c116520. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QM4DW1607796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24f0b1e7353de157a0bb87c572e1396bf429124c77d494ae161913c429343d0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM4DW1607797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aef5e0e1d9f3eb6a84b0d93817384953317bcb2711db9736b9bfe88f693ae01. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QM4DW1607800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be0b1a693d999c8913e88008257e14c40ae63e156a4addae57ca0d963931783. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/QM4DW1607802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54dc461bd43dca940a76a1616a2a9a31fea09e06e80c085b6bb6dfb2c6456b47. 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/QZK6P2146459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f068a365186b94ad280801fab6910758d996f862b4c9e659a1859ae6092b01. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/QZK6P2146460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfdf0bc7b0b57135f13d59fb101200119c55397b1cc5a4bc2feea73fba35ff1d. 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/QZK6P2146461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d14c51137994c7979f5cbddaf78a91b5aa1e24e141681e6f7ddea00a76d36ec. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZK6P2146462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb537049e0908fd65626410c29995dc2bf63447579ff2176a776931067662d2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6P2146463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3be00480146f59f261fae668d1424c69bbcf4d8d1f566d063965c04f357ac6. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6P2146464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d189f469f532969ea7f0e70f62bb1924c9eda157e3ebb9e6f951ade68005386. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZK6P2146466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3495ffc76ea754c54ad33f6b2b445bf36ad380bc6098872fa9eaf6323bbb94. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZK6P2146471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8f0e118720f7d91e9ad439273ecf14db67a59dafd221377898be80dd0e2f73. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6P2146473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec089de3d22bc2c717df7f3b95cf0e25a695cc9d3108013ee90d67769876a7d1. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZK6P2146477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc997ebcc7661ed4baa7a2b223803501443896551f0b2ebd59d3eed94612fe025. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAX2432002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96ffe7abbc0eb7455cd121b13b024ab6808e0a3ebeec6486f037b96a23781d6. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAX2428581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ea2789f7af89641937dd4ab01d678a0f4068b3b21b0dd11f2ac00cefc975b6b. 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/CAN112200501.