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 0xde9bcfa9ea1f820ab6eb0a1fc44f0b8d114bb5565e58c4596b40b129dd0c86d4. 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/607e2640-5066-4dfa-88c0-45d3ab904939.json and https://artists.proofprofile.net/proofs/artist/607e2640-5066-4dfa-88c0-45d3ab904939.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 0xfaae5525716830b1e83ca84904f5affac3247d96162cdac4b6d7c77a9975203f. 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/NL1ZN2402875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e68f8fd7539cdb2ec3a673b4b382e7f1c7c5d8df678dffa00978722a8e4cd0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-21T08:36:07Z), 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/GB8KE2405666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975328f8fb67f7b759d8f273bb01ebaf05afad070dfbd3967ec9020e657609c1. 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/GB8KE2329343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58884494b4c4010275d1e05f315aa976f3c371b52f45f7653511e447116137fd. 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/GB8KE2325478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x270a7fe0db0246f0206ed2a32ffd288c9ef03c5f415c2b0e6b5cfe984470bd80. 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/GB8KE2320851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86c56065b31090852d774c253fd68e26d1f032e1f0a13c7d0893f4c1700b67d. 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/GB8KE2312414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6369f8fd53045890a205db6b19db34f7d2c26e5045797464f73d2e44dcc0e109. 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/GB8KE2310195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b14f9dffb7818ded67149566d26c65de4a1fcaae780c8313b9f81232b885217. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/GB8KE2215378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f4d0a20a4f3822c122868131539f7c189833a450d3e48534ff54c301d6d716c. 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/GB8KE2211282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde437a07f6fe62996dac7fec724ac7f657d32e12e307c21500c9f1e0614da8a1. 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/GB8KE2204105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e161adf65014f79c27b4a66b92151829d0891a7b7d21fdc50f702e371139759. 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/GB8KE2159486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a4a4e14325d9c985f5438cad268abc20c8c27f0dde65564467f3a967903ecb. 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/GB8KE2055522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221a4228ea31f649e3dbbfafebf99e39ba14d98ae98969586636c18a632c2d07. 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/FRX282067765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d0af6bef773bdb68ed46635359883d8f519f06a9af1201e06e4f7dec1c13b2. 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/FRX872194795.