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 0xce054bb8227597694fc0c01dce4abf97bdcc3709c906bcf58e0501701282e742. 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/5efcf276-2e3c-4b33-9499-443686cd249e.json and https://artists.proofprofile.net/proofs/artist/5efcf276-2e3c-4b33-9499-443686cd249e.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 0x2fe2d74dcfa9a4dc047569a0161b5e14807d045f501dd2227424d9757d939979. 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/GBNEQ2201000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8d988390c94327deec7830b162d17d7389d90f2d3be2b527eebccf9575de70. 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/GBNEQ2201001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2567a544777359f9177c15ceb937686b232cd1b0078f6186c719abf46795b52. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/GBNEQ2201002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1ec4fe6bcf5bf45cb7c730e74c6114e7167bcff1c1a51f7e264679c17a88de. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBNEQ2201003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b0941720d6d57e022f4f5b002ae104bf7251885f9620c89b143fc03d724f00. 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/GBNEQ2201004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b81ea7113356475801ad1bb9e8ca76840bddf4b773af0e7a4fab2f514ff47ff. 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/GBNEQ2201005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8ba223b0982ebbb7333d93e1ab1c49b8d482e67dd76de88609463918453bf91. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/GBNEQ2201006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc388907de02dc8ca07bf521d5a9efb0cfde12000f1dbdde0b054e03882b9739f. 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/GBNEQ2201007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6c060b7a48b829ee8922ed26ab6e4830819fecef7ea25854647b4e3b10a60e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/GBNEQ2201008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74329889b23f2de5cde09b7e5b7d48f77d1711f5f21b98a8982537ac4a2b1f49. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBNEQ2201009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87cbbb3406dc6149c838a9debc8e87c2d22fc4970987283ce0a99d8e3e8e0ad. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBNEQ2201010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5c190615365c1a92c870d43c8f771082fc4465ae8d587853f543cc1baade45. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBNEQ2201011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xded016521b8a26e425a5cd51142bd2adbc0c8a2eaabc07d5675ca5652569702c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBNEQ2201012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0763abfc1adfa6ea5dcc3d39b49e6f1c0c25d97472dea807f7fa6d24cbd64c0. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBNEQ2201013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440ff4a989def236255f96eb409bc25e7a59a4c4a51790cf905a6cabe71a3b7e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBNEQ2201014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2bf87d0da093110ef5514fcda85684a11745c4c5339fd4e9d06465ea08e5d92. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/GBNEQ2201015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53613012506318e59d8a1e00a842c41f05dbd06525950bc28ea3321b01fb0d1. 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/GBNEQ2201016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3ad5bdb7eee652b293d3a83592ccf807b5775ad0e00dc8ccb7e69ba7a80ad2. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GBNEQ2201017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652d155ae3838bee0456a73f59370392c791a3213514911dd619435e52e12ccc. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/GBNEQ2201018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0769562d4348faa0712c3a75fc2b28088dba0e29df6dc70b75a5e97dd573f4. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBNEQ2201019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x952ac8c19b9ece58031243a5e2bad3230a4ca793deccb7f8fbe6737ecb5700e7. 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/GBNEQ2201020.