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 0x104fb47619a33be86989a6d7a27bf7cd3f17ac06836aeb0adb5d1fc73dfd0ce2. 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/251e6fe8-b621-49ef-90e5-31fbc31e5736.json and https://artists.proofprofile.net/proofs/artist/251e6fe8-b621-49ef-90e5-31fbc31e5736.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 0xb5c2e7cfa8e13ece326fd4ad5ea278f49219b9a456d6b0b70bc8014fdf32d660. 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/GBP3D1000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bc4ce36fd5871b57233ce119c1f17cb095eabb09414323fba011215fad271a. 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/GBP3D1000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137c6f788de178f54c333d1b6b1fae8adb69e14e062b32029fe376354a8e2792. 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/GBP3D1000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd38407f44aae3572cd2a9ee5b25b87327cecdb70c6a9af8f0b9606ab8e030da9. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBP3D1000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09c1f3c1963ad2eb8d5ad61b853d3166a6ffe55d6839a45b63dafc24a24afee4. 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/GBP3D1000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd762b2b7d802f7ac535cd859f05cbabdbe73fec9bf0708d8381da5e16e1053. 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/GBP3D1000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1211b75c85c884971b551e4b271f3be67dba5ab8fcdab28633c56be893ea4096. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBP3D1000007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4529762b7fa9a24e539f2f41ad9b99975e77477cffac9713b7af38aef0cba41. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBP3D1000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e09493d673388b2a34b6d10d3ce6bbe197a27d351d351bcbafb76444924beaa. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBP3D1000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc608de79c321f2b033f906842514ac4f943e48bd8b1ba8e5cc35f8c7289b2bf6. 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/GBP3D1000010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f4f8bbae15225350e212a78edf437d07b060ce23236ab36be07509548cf852. 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/GBP3D1000011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c402abb99795665e462fbe920075fdad07b6792617962958bb8d17417da1a35. 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/GBP3D1000012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3547153eba94009445d5e40013e474e869564be51774be97246d26814f628c97. 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/GBP3D1000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9bfbdfdf4db35e1e3850501be52e68955315ab3cfb5eab8677d805f40449bd1. 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/GBP3D1000014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7f3425c6c6d582c497cd448ddcc01996f2bc2b4982c9cb592f9df271d992c57. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBP3D1000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b49307783e6155ec306b4b33d96e980c98663dffafaa6702cddbcc165836cd. 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/GBP3D1000016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e2d2a58659c9339639f39170e48c7e5036acb391d98c8886f4569eaa57a997. 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/GBP3D1000042.
Blue Tit, Yellowhammer, Corn Bunting and a Partridge
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bee18f6c4973140b626c8d2999dd82c047b33ce3a7a11156bdb2e88ac4e28d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBP3D1000043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79cc723f648aff53f4f1b7bc4a46a0e66369d6d0fcda637c4eaa9edd153b3787. 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/GBP3D1000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427f3632360ffd199a875caee8d1de85441614bc2576f0c794cad6518dfb79f0. 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/GBP3D1000045.