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 0x8628ac076aa012f29598c429453b719fc0c904ad09c4bf1fd69bbfd4b921bf4a. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/673ea1da-d386-468f-968e-1525a5966db1.json and https://artists.proofprofile.net/proofs/artist/673ea1da-d386-468f-968e-1525a5966db1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cai Thomas: Wherever you are - Walking in the Air
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 0xf0eb2ab6ac722bed83400b40b2bb112aceb8394dba606081123ebcc0d4f4f9a4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/UKGFN1900548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefeeaccc6200561c8b082183565a59f8d4c58d61bb1cb64c8efb903a68c53366. 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/UKGFN1900549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1feed6720396e66921ef4d5a3638f7074b4dc8be4d797b656065253ff0c72ff. 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/UKGFN1900207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc1aa289eb434ca0dde46cb2e91582fa7fda5ed6930c48a889c785ddfe17bd1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/UKGFN1900208.
The House of Life: II. Silent Noon (Arr. Fraser )
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55431bd2524c51a22ec710161f28e6acc10aa70040abac3978687a69a6cd2f81. 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/UKGFN1900209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1655861025b4f2ec016b19f52c534542f0b06aefcf7a3aad28205f27e8da81. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/UKGFN1900210.
Les Misérables: "Bring Him Home" (Arr. Vrtacnik)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72beb675fe350472f191d7535e23c591968d38be35ff1e58df2dd54f9e19a361. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/UKGFN1900211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3573b6aede047c3456d7f42f407dc99b26da7427f8853c6478f98ef1a0e4168d. 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/UKGFN1900212.
Vesperae Solennes de confessore K. 339: V. Laudate Dominum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0ba5c7d1577e80917277eb59b31491cc60c256045af01ccbd4e8d3c853a27d6. 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/UKGFN1900213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9787bdf082de75f2e30ce245b3817ef1a851b7cf88d0aac69739e4f4d8b37e06. 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/UKGFN1900214.
Requiem, Op. 48, N. 97: IV. Pie Jesu (Arr. Hill)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87d8c771c66d4161c16e945fba7d0c1544c821bfb9f9066d36e4ed30101c53f. 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/UKGFN1900215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244857273c46c2c30bf3dcc66082abe8401507aaff184a52c5764fd07aa8b2a7. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/UKGFN1900216.
8 Part-Songs, Op. 119: III. The Blue Bird
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15726fddc11343de61ece148da8afa6da2fac0f4f8d860eab33d18181c0e1ecf. 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/UKGFN1900217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb527f1d46a1ed5525bdeb831b38ae5f074cbff82ef578448f107530f1c5cd3ae. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/UKGFN1900218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13d47a8f737624f4a3c51e7153eb6c179cd3114f63a63feebd3710fc88c6bd0. 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/UKGFN1900219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3573b6aede047c3456d7f42f407dc99b26da7427f8853c6478f98ef1a0e4168d. 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/UKGFN1900212.