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 0x31fb3012f1bf41c3aa59c33fd9832c49688f5fa02a4fee5ce93a634e948cc5b0. Chain 2 (Bitcoin): anchored in block 953617 (2026-06-14T09:00:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bffaef1-acf7-4f46-a925-5506de789f82.json and https://artists.proofprofile.net/proofs/artist/1bffaef1-acf7-4f46-a925-5506de789f82.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 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 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 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 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 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 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.
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 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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010fab772f0a7f47d4c4e9545db6a9b09d81c0d31514fe9f4668f170bcd61905. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBP3D1000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae950efeb39bee24bf73d11771dacb951ca5e06a44a51177728991d4cf7eb911. 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/GBP3D1000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f3561bc41d1912173cc164fb8862300c0c29c5930af636ecb03407bd8ee798. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBP3D1000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36c5a877061a96e495a3a63e567dbe5d72fdb76ad09f3ed46c6b19c4c21a3c1. 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/GBP3D1000051.
Fresh Handmade Sound: From Source to Sea
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcdf5ca4608c3ef182133252616a430e27bd7e82e60660d890b035175b73eb1. 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/GBP3D1000027.
Manx Shearwaters, Common Terns and Arctic Terns
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b2a9ec4c27bed4342b0e74dfb1bb777b4b14402ad790bc4efe49f954642023. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBP3D1000032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2379c20e92d6f9bbed5985f7caa2f343b3a110f5276e9088c09d592b2741a5a. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBP3D1000035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf673f51b94b1758d89edf6f3c84fca835c9e181518d261c48547b1a4b55ba236. 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/GBP3D1000037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0a3328f0dc588a058f43cc751b3de5564f3ce64c9efb371f11406fe98ff1c5. 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/GBP3D1000040.