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 0x985aa654f63da2c3651793f44322966eea5ba5483266f94f95b45cc69781296c. 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/f0cf5e88-71dd-41ed-8e5b-5e11e8300122.json and https://artists.proofprofile.net/proofs/artist/f0cf5e88-71dd-41ed-8e5b-5e11e8300122.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 0x6ce0957b5dd6204d1be92406e65104f02c9ee81d2369f9fc98bcc6ca9f2248b1. 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/INC622212667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22a7f5ceb0f7355a9e1e46376b4c8c2cdf3530d9ed231c445692780bac21baf8. 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/INC622211807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c855dc00f4de62503abe59883e617197a53f9aade5ad5263082371a9c93792. 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/INC622211236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d5844912d2d819bec0a37e7ac996afa914ee08daeef7760ab82437bddccf06. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/UKJ8H1993459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9cfc27b2ff8bd24a8b2c8d685175e0477d5aa0bb8a9d6dd18f848add965cef0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/AUBEC2322398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dda51aaa200932624c4defc0f4c6717f070dabe5d4dd9f592d9b98a04a90e04. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/AUBEC2304651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8ed6aa8a34a91062df6c10ab93c0a58d69e0281265f1ee08cd7b3c752485c4. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DGA072269559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d351c386523368214a743569018502bec1a4ddc239e76dfd616e5f2a3c0e066. 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/DGA062277511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f6e23c1786e2fc11d69848521edfe0f7d09e50d142317ba1e8e0877e8b9690. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRX762224754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09ec277cc6e4b4c0a3145a44eec21d84c5cb083ed2e7985e6c55996a5afbd020. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/INB942200215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a1221d45044d723ebfb4c5224afba5230ea4c06706a5f3ae28d094131b4d31. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GX5MY2175576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0448b8220cbb7b99922c222a7dacd47c2fc6f0e3a6447a8a14d57f3f2b6c5a34. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/INB942100793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2822f91c9261b8b162faa1a5a381d8d1301e3856f18d5d51032a9bba04aa734. 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/INB942100413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60167bd80882bc8cd681d1e3490aa2da7ba05c1025e6de9db0d865f512ab051e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRX452185849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6c5cd1f66c9ad6b4bd840d7ae612a2d5d13081496ecc7492e555c1e9e7798c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX762144120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d7b251b1499ce3fb824909396ac5917824eb08a7d981d8c16bc85b8b5087721. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/FRX282121406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a5c72ee6cbb4330cbcce5e397e037a28fa0b488ce0ee075fbc159eec65da60. 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/INS402000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfca7568caa47191dd0f9f992d3e196197c406cb3694a7464d3838c25445e8594. 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/CA3SS2032901.