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 0x2c8434ecfe2ca19e160b7093c4fdd7e5a8b7f734026c9f5c73190becf66c4065. 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/329c7627-684b-48cf-91e3-7ff004623172.json and https://artists.proofprofile.net/proofs/artist/329c7627-684b-48cf-91e3-7ff004623172.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Vida Breve: Danza Española No. 1 (Arr. for Harp & Guitar)
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 0x321e0a3f013863faf7281048109cf14556883bbd9d7898b75428cea2be8b0701. 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/USL4Q2176849.
Introducción y Fandango (Arr. for Harp & Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e028bf5b90b0370b58654c734effad80423e91d9e2b37e43b3998a14c3ab12. 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/USL4Q2176850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafac609f4a9d5939347f2da4cddc2d04da7383c88c4b083bbbd7bb547233ee5b. 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/USL4Q2176851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b40b2c74c7ca7c63503808753b490069e9797834eacf6a7ae3a9eae97d0313c. 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/USL4Q2176852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166e3197066db6a76f44c8dd20a60b43b3e571155901b526ee91f43e3f2073a1. 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/USL4Q2176853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42cc78324a8fff96b5d69aba000063e0985d758aeb2a566b01f31b80b65a2d6e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USL4Q2176854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceaad9ff66926b7c8e5b2097fcc3cbfa66e843355adc5ba02103284af9741b21. 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/USL4Q2176855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e25b7c74d8c869d9200037698152a1a023b687bf3bf3fcbbb81728ca36df1c. 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/USL4Q2176856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45b78bcfc8e1529e7841bf4fe89ebbd48dc0ab702cbf4fbf3e7c5831bdbc28b0. 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/USL4Q2176857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78163d3bc9c3ae3feb979956ea53186d500f0a1c590c052257080806764f630. 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/USL4Q2176858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0156e6174915fd339f0d859374f2d3e2c6ce7f46ee23ef9ed080647cccc44c7. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USL4Q2176859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dbb74b1515325168df2ddaba158555924481530e16d002cd94f61f8accba02. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/USL4Q2176860.