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 0xf0293bbe7652d5aa8a25e232bfbf5f88071e10011b93a554395bc9957134078a. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/61548259-15b5-40df-8c93-ca0acac30167.json and https://artists.proofprofile.net/proofs/artist/61548259-15b5-40df-8c93-ca0acac30167.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 0x9b3450aa86b29237bb5c29b2af2737c7b7caea6634473d583794b8746f6ce933. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZTPX2433135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1a73e9f631acf4dd563d3dc0d995ab5d39ffc2b33e3f20109ac64943785f01. 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/ESA112449951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1532e0b51c3246b291cc96a01bd51d014d85665952f1f4f7d6c2c926e2e4113a. 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/ESA112447808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fdb0d2908946af10ee9db64b303bc9814bef26d889b54bed9d2871914858a96. 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/ESA112447806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x410a74eec414c38c6120fd60fe8b8e2e919a86a6970f1b59e1826d2e1b91924a. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ESA112447739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8515372f7ba2eadf558f956850210427c44f23f18d301687a580f0d48761db0. 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/ESA112447702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0221b88bdc45c39e95209b610ebe96412b146ea36eaeb85c76e2f459634b5759. 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/ESA112447701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424ab55e613850ed2e225f66121a266b539c8897e14e726fea02148112e51d83. 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/ESA112447698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1295f7c9e643e25dfed1603b8cd0ba4eeb6f7698f20b4c98c1a67f658e3a9937. 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/ESA112447699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x839ebe157ef19b9cefc2d38f24eea87bc18b542608f8606650ab86be37d9acc6. 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/ESA112441192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd26aca23572736d89c9f34b8a01f14c0720c3ca91d2165ceff11dbbf2270b09f. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/ESA112441193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfabe2813888e30c1eebdb6e17ab97ee1fc72e0a5104b6efc5ffe45a9dd06a507. 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/ESA112441195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f7c0b568c64eebf3815f01a72ef9f774dd4d99cc9df0e20fb8e84b9a5b3294. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ESA112441001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb423662592178ddff78ff30675d660ab5838a309b0f3c6bc0edfc027e848a51d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ESA112441002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7157fd8f9014a7f7ebe8edfb912c7aed348d4277706f4ffbb85fc45991c058ef. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ESA112438217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ea6f4a9f95475ed29cdd216621131cd2dfb545ef20cfa9c317f5e585c4c7e1. 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/ESA112438809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5911916e353a222d99260253c78848854ce394febc4715d359422ea5e50c9e3c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ESA112438805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05c0f91b3231abec19c36a0db477b4b56d06f0da8acb724485eca74ebb3b4527. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/ESA112437812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb2afd9da2eb9b445533bf8e29d7f5d9471ab3aac8477bb86528bbac7645e886. 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/ESA112441194.