The Gothard Sisters are three American sisters from Edmonds, Washington, who perform Celtic music and choreographed accompanying Irish dance. They play nationwide at county and state fairs, as well as
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 0xb29a6e59fe2f254da84e54df457787db05381e27bd1947c53634b5d6868a33c8. 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/fec251ec-c795-4e44-98b2-8e067921592e.json and https://artists.proofprofile.net/proofs/artist/fec251ec-c795-4e44-98b2-8e067921592e.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 0xa56e4008f9b5eb57bf3a06e7628b193d592a59f4206db43ba86c39ebe85033ac. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US8XA1000220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf783f67d82c1ad41a38ff4e171c32b337be302232cc1bfddbb09fff7b859d37. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/US8XA1000221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca5b411908256905016cdd952e72680c88ef90d468d0e7086c3445bdff7e370a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/US8XA1000228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74c5497fded3096e657637e8dcf19f90d2a44e80bd149c1eeaf7eed39721ea61. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCABB1140692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59163e4219f1454273e9169df114df6025edac5e87cd3a51a81ac0baaa58e214. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/TCABB1140701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2474aa8146c15a8c034820d5e66e0362099d71f337f7a6a9554e103acfbddca. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/TCABB1140704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9e1da6a83f95cbdfdbec3b8055018d73744f289521de0f285b81577068904f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCABP1350483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87453249766fd74e2aa22b01d7c6814e1236a9fd5e3aad2120d1df408013ed58. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/TCABP1350491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6198f14a82f420fb673d3c77a81100986dbbde9bc9ee52523f01e1a9c52a1e3f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/TCABP1350495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f3a3d38fc634b1673bcabad60ccca6c65ed3aff8208ddf9d5f258a615b675d. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/TCABP1350501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d530738b748d1c20cc7399ef3929b07a3bd2181fe0f1cc10b552cac07685c2. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/TCACG1553933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61845b855dee724f32f1aa9c9627be23e52634e33a9b8b911ae9d076276ea207. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TCACG1553963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae510dfcc8b4cb0da95a1dc6643b046f3dccd840813bf77a2834ddf4a072c28. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/TCACG1553974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af89e673861a8aa9e342c449997be036c1b26a46085c5bdc3f61b7f8e6213cc. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCACG1553976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ce27c7e4c11c688aba90a2a2df110b4e526cf12e8a885952fa3c69e6060528. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM9A91617200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a8befbd8b9da91cdaab8cb7a1fa1fcca7b1a9181efc5a275edb8827d32e48e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QM9A91617202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb36ffa077d80d5408aef54145ccd3d0c980b72ec5c03fe6c44172584735030b3. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QM9A91617204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a944c1e670813ab68e5d20d96ff8a23260a38975fd78852866741c174c4411. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), 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/TCADO1859785.
Celtic Christmas (Live at Central Washington University)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9679c0ad6c111f28ac30c43e80654b81fa04157afc98cf3e08bdeaada08cf257. 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/TCAEI1947563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4592627def570a27f85e3d902de1fd4142e641c33d74183aeba006e28c422f9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/TCAFC2042323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cf0928445c72a3c0f45838a9a41742daa1aa89a05e0d13c26f789bd15f9d62. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/TCAHN2392205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d602ec56f04b96440041cf0d84a454f3b1379841cbbdfaabd9b6339d7c22694. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/TCAHN2392271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a0252a26d57c8303b44c4e63c47852f9434839bf008318147177d03bf21014. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/TCAHN2392281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e429b0b3d106e2225a0e8f471d1e7b7722e2129f4af0abf71022ef45b6372c. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/TCAHN2392285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66c3c45432ebbb3647cc3214ecb16f0a7998543b6f2b977ffc613e60a8f1af02. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/TCAHN2392290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b2c5bc6b078d36367dc1fb7229e9bc34d33f726e3d68c39ef4ab9ab9a9649a. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/TCAHN2392297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa233dd97aa0156c8fa1a86b1c9d1a9cd4129c079628ee222d7a776b935088fe2. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/TCAHN2392302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x774d281df5dc26547901d0401e73d61acd94f6587d4f95161090a16b057726a6. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCAHN2392315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ee50a8043a080877c63711b0371446e3ee2ae97ac47b54ddb7fb312d1f9cc5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TCAHN2392321.