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 0xb1acd043f5ac74dff882ec201983d72eee09e5e498f2f41c48f4b12dab42b559. 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/5d1be2a5-f951-4c7c-b94a-f035545b66c6.json and https://artists.proofprofile.net/proofs/artist/5d1be2a5-f951-4c7c-b94a-f035545b66c6.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 0xc198dd13a67c86fb36d276c683041faa49632260c8d863fc3b012bec8a60761e. 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/QZMEP2386579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc9cdece37ff86faa64a1aca23f122e4f39c0071a9b05058b38fd399e3c760f. 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/QZWFK2380409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ee7a28b8f1d335680c99314e07cdd3a6ab612da8876d0b0ba777199612b0f5. 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/QZTB22313347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd251e08f5ab50300d5d04d9ef39d1b200ff5947c9bbdc19daca49eadde2b66ff. 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/QZK6L2537824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e14f4c5185de79463fec7b1224df4217a3d36cfed51d7e847c60640f3c80281. 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/QZK6M2576701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4765a18794267dc4cbdfd98c976fb299085be91fd451c2f04dbdee3207b400. 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/QZFYY2539513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a0041d97caa33eb95ebe1a8c2bfe671b2ceb8a87b2b05d5f024885bc667e119. 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/QZFYY2539514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1112fe9191e8b71cbedc9ba7d2b6ce4821254e144041ff0e006a6e2578916e. 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/QZFYY2539515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5261b4dfd38eb37e5037de6b7c300f2cdaee6bba1703cd459b52b81e19ef2cdb. 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/QZFYY2539516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284f2c5bb6565a134ac83cb2e1ed196908dda43f0034f35c37d358a3e38b656d. 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/QZNWS2494352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52f7f077f74cb65d8e33c05de0d167be34560d818a96f0ffcfc56dfbc88f2274. 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/QZMEQ2459718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702c6566a5d29ee61460a5af8a98ac649f4045c177a9770e0292deeb27cd1b80. 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/QZTB72388645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05107d9fd81e9519b03b05f11f33aaa3646b72376a0f295ab540fd4098ad6ae5. 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/QZNWT2385821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f527ac865dbf053de54d7f77d7a59767de64a31ce5aaa9e403559703581ea02. 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/QZPLS2598071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3e2c66978ff69221ee5afc0d087f07adb7aa88835d5158a3922c6ec7258f4d. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T17:05:01Z), 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/QZTAU2567373.