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 0xfa3f9cbccb68a3c352b12f5337ca49549a3ab241ccf06a26601485b44da29065. 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/e39a67ab-72ec-45e6-b248-362bc6ef0d6a.json and https://artists.proofprofile.net/proofs/artist/e39a67ab-72ec-45e6-b248-362bc6ef0d6a.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 0x8af57af680695ae344318a51c0fcff14bb667c033cc476c83839ef8f7e940198. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CA5KR2365255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c4e85f2a43def56ca24fb970c68e27ee8f7f849ea2fb45b16f8e5d56cabf1. 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/CA5KR2365256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833355da8c4625a424f145b1d9af57a8384ba5bd6475cc742c1ea7c0fc234fe9. 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/CA5KR2365257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b135d0362107f2ed79ee2b80780808222c5b1b297934fdcb460dca922a10838. 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/CA5KR2365258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6d5098aa9c79ace0b1d3a1540d1f5f007d3e9caa5d1f2ad4dc1f21091180ef. 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/CA5KR2365259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8079ca90fdbe46e785ff5d738eab5a80ba024d6f2e8e36f3758344cbfeee31. 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/CA5KR2365260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815f95c017da01474cddb421cec80e8eaa7c43228e57eb43d44d3d26ad696ae9. 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/CA5KR2316765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b135d0362107f2ed79ee2b80780808222c5b1b297934fdcb460dca922a10838. 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/CA5KR2365258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af57af680695ae344318a51c0fcff14bb667c033cc476c83839ef8f7e940198. 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/CA5KR2365255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0242455d59705d2bf3f1bc9153873cb1b75268261ab586b03bbb3f5bce9ef41. 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/QM24S2201251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0242455d59705d2bf3f1bc9153873cb1b75268261ab586b03bbb3f5bce9ef41. 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/QM24S2201251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fc31a080752d232f9bbfadb9df366717db0a25cd22e339446e3c7d253665b7. 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/CA5KR2426384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9fc31a080752d232f9bbfadb9df366717db0a25cd22e339446e3c7d253665b7. 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/CA5KR2426384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x833355da8c4625a424f145b1d9af57a8384ba5bd6475cc742c1ea7c0fc234fe9. 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/CA5KR2365257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565c4e85f2a43def56ca24fb970c68e27ee8f7f849ea2fb45b16f8e5d56cabf1. 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/CA5KR2365256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6d5098aa9c79ace0b1d3a1540d1f5f007d3e9caa5d1f2ad4dc1f21091180ef. 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/CA5KR2365259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8079ca90fdbe46e785ff5d738eab5a80ba024d6f2e8e36f3758344cbfeee31. 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/CA5KR2365260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5a0b907db5e4bd73acae54b4228a4635c7da91048e11ff2eb032cf3b683301c. 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/CA5KR2328612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815f95c017da01474cddb421cec80e8eaa7c43228e57eb43d44d3d26ad696ae9. 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/CA5KR2316765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815f95c017da01474cddb421cec80e8eaa7c43228e57eb43d44d3d26ad696ae9. 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/CA5KR2316765.