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 0x5a521f50db5cb78e818c1866f359dafa850f50e53c20a1a7b487268652a5f03e. 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/40d4b3df-1adf-4492-8305-ec104209f8fc.json and https://artists.proofprofile.net/proofs/artist/40d4b3df-1adf-4492-8305-ec104209f8fc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x47fbcb80c935be1a3c357f1960581d2b5b1bb7cc2079e85c8a32a3ae7781e38b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF079311621 — a six-check JSON result.
Porgy and Bess / Act 1: Introduction - Jazzbo Brown Blues
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0989cf4b423066f6b85a8088025c5faf99d91c3bd03c972610eabcb5dc9fdc22. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf39548aa4a3e6ec3443e9c7d5d0f6a68c50665d02dc497ca4bd4d973fbdec27. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540202 — a six-check JSON result.
Porgy and Bess / Act 1: "A Woman Is a Sometime Thing"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659574d7d15bc787236903aa72cd11c486c9fa2d71e345b35f0b3dd2121d173b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540203 — a six-check JSON result.
Porgy and Bess / Act 1: "Here Come De Honey Man ... Here's the Ol' Crap Shark"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd05fe884d7868bb8731bc2f6e7e9da25343e24f4768d6d93a52b566acaf3f13d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540204 — a six-check JSON result.
Porgy and Bess / Act 1: "They Pass By Singin'...Here Comes Big Boy!...Don't You Ever Let a Woman Grieve You"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2277a766308cdb399919937523a83279d13281c5e00efc52329bf571dea6ba05. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540205 — a six-check JSON result.
Porgy and Bess / Act 1: "O, Little Stars...Touch That Money an' Meet Yo' Gawd!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ba8ff4b30b0776550af0a8d730da34a2d4a409e12a0cebb686c4ccf61422d7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540206 — a six-check JSON result.
Porgy and Bess / Act 1: "Gone, Gone, Gone"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c23538ab5bf618d887d209f525ce4af962b266e7869d23df36353eb18908686. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540208 — a six-check JSON result.
Porgy and Bess / Act 1: "Overflow, Overflow ... Gawd Got Plenty Of Money For De Saucer"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62cb3c427e59d0d6f8a4f42c0e3bfc2a876ca78ee16785c4a6f7730332c1fffd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540209 — a six-check JSON result.
Porgy and Bess / Act 1: "Um! A Saucer-Burial Setup, I See"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778c62c7aced9cdf6e846e70ad69b2e2a8b9cd470da42f66e94a57d8faa5dc42. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540210 — a six-check JSON result.
Porgy and Bess / Act 1: "My Man's Gone Now"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda75da9155dba33c16555cff9f38ee4caa7c252065a1b4265f79a0f970d49d3b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540211 — a six-check JSON result.
Porgy and Bess / Act 1: "Headin' For the Promis' Lan'"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d227a662f64495ae8f03c0e3b75f919c928ef21099c2facbb190a3eebbcb463. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540212 — a six-check JSON result.
Porgy and Bess / Act 2: "I Got Plenty O' Nuttin'"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900459460186726cb313e0d4b560c5a42d8edf6076d64ac5af53e4f9240168c4. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077540214 — a six-check JSON result.