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 0x1ef10fc794a5ccf805b53b73a633882f12d319f4b24d81f58f512aed513951f3. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c26ce315-e724-4d64-93d0-a0e74f7c1b43.json and https://artists.proofprofile.net/proofs/artist/c26ce315-e724-4d64-93d0-a0e74f7c1b43.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Espectrum: The Avantroots Dub Techno Compilation
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 0xc8a5a7de494b5ab30dc68dbd04ef77720e2216ee7c21244e62233bfc99541e3d. 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/US83Z1656112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f65601b625a1c112e2600b14061ed9f60326241225897a54728073ce15a9cb. 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/US83Z1656113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x943868287132fd5c55b3509b9c88a947dc7b026b1ce1d98f38f3829773b8faad. 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/US83Z1656114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46949f330582a71fbd70b1aa32950fe8e1e5789e7824e10ff8a9717bd14066cd. 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/US83Z1656115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881122b53bc4561a3276248bf38975a620c9df3b3e943c12cfb98aeed1c4263c. 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/US83Z1656116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc3b5e64fcd4e996f723aaffdbe5220c8fb90dc47cbef2f330fc63bd76efeb4. 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/US83Z1656117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb6beb48787e37c24a50099ed968e7f1c5fca6c5d3590bc754574ea0544a211. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/US83Z1656118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e16d66467877708187d8a3375b6dd87040a81337e5fa2b48560fd930e31989c. 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/US83Z1656119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2691d33ba7b81b49f49ab0604cda9310e0d744f76b9ddd2c5554cc1da6e3f4f. 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/US83Z1656120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ea1053ed03b82d67193053676549bb2e5b93526193b55c2172493ad88e453c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/US83Z1656121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38abea2054ed2e3a6786969cd608f728a788f45195a5013ef6c2ec21411ae86b. 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/US83Z1656122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39af25e9192b0c85a7d0f2d77b2e849a2035f63caa6780e6dc8b710430ebef13. 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/US83Z1656123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ef4c08150e3b01fd2043850c760a0a04056bb3b0cb5d186cb41b9c5d623a366. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US83Z1656124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84f739b707f5706f6f558d8672876de452e892fb02d462dae625f2f2866cd8f. 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/US83Z1656125.
Espectrum II: The Avantroots Dub Techno Compilation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece0c3c0a5a2b74d78e49e461c0a058af4e1ceff2ab747f36c9e5caf47dc0372. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/US83Z2111192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe84a6c31ad5adca6a5642be4b00770c8d518f2534853097640105f62bbef67. 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/DEG931300342.