The Concordia Choir is an elite collegiate choral ensemble from Concordia College in Moorhead, Minnesota. Founded in 1920, the choir is composed primarily of undergraduate students and has been involv
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 0x0e02ec6c0afd91ea4ca98f7bddcd4a6f886fbe2971542efa608836977d082a60. 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/de38a077-f4e5-42d9-80c2-c059b5b33aa9.json and https://artists.proofprofile.net/proofs/artist/de38a077-f4e5-42d9-80c2-c059b5b33aa9.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 0x1363c4f78f9abe07e907ff246ee750901dd61f76dbf0669e8c2771172d7db1c0. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USTC30731572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd41808bc48c2cf3fcf9171ba45192002e56f18227a0c9ce5c7a177946a0f852b. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USTC30732168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a23b87b96d09049f3c6b5351884707c9b57fb3666404de7a407a8ac2ac95164. 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/USTC30732175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207c2b85b4810b82e9fa403539cbc291918ac37c1de3da95395c9b73829a7c46. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAAR1019149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce11c56aa49d92a06175b231086272c6fd853ed85178497700122207ee7a4d6. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/TCAAY1185643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a497abf3ef75f13f470def1e0bd207b594240f6ff80da7042bd1db0516b307c. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/TCAAY1185654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b6ee19640f52af73a047812a96f874a65ee7aa05d3884a27c366432541c828. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/TCAEK1921598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa454ad152bddf9fcec7845d58ea5d7fa20777d5f905489bf93c7520306b451ef. 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/TCAEK1921602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d942e71e65de8ef5820c027d694c9f6c1603137cc9508c318f387cab23413d. 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/TCAEK1921625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc7483bbb452ca3e5da06587fac619ce1e9e88c5476a4b37f4b3fd0ba06068df. 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/TCAEK1921631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a28268c2898498ad8cb47c576c37a8787bcc12bbdcb5a1b36cc4249134410bf. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/TCAEK1921650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8174c01b292474d5712ec1d98cc6d4d1bf73ce2dd87fce4e9cbc266cb05306c. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/TCAEK1921664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656a49b9412a7315e07cc13491ca794f414af849cc8c751a08a946cb839f9e85. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TCAEK1921733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89710e4f16ff44d8a67d69ab65560bec804031437e2be922c8c995ec840e4cd6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCAEK1921678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d09a85f39727374b90eeeb07884c1046071407d3b05c08d6045b9bc62fac927. 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/TCAEK1921683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa578a1bb07c2741042be05dbf84286d4d37b743fedc88805d72966cc7f2950d8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEK1921686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a95e3ed1e0c12797195c4a06875c2efd60227cd8486393122505197698aef3. 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/TCAEK1921690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7de5d31234a9f0095f45b589c27ace7cf34ab2221d8300c4bc2ab99072fc2ab. 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/TCAEK1921705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7e20181b8bfda185827eff60fda7108fcfbf25540737b7f843f298860d0ffb. 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/TCAEK1921724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062c7d8ed84aa4d9cc46507c35b0dbe2be024d5135d05895e863e5690bf03c2d. 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/TCAEK1921731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf64b69d8d37e43e25dc903f0bae82d65ae3beaa26083b7bd9c66ca19e3b0fd2. 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/TCAFR2179945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb95fc506a3ae04d31ef76dcb1354ac12856c6412a6c54f24463442b4298f03bf. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/TCAFR2179951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0031de9ef1b6e535ec0e8c010770f8eb253759af5d9735d346ef5f78e5b8fa2. 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/TCAFR2179957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb754cbf0533f09cb16b07143a9be9ccc47bc6c694569831445a2823f6928c08f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/TCAFR2179969.
The Promise of Living (From the Tender Land)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed2fbf60c0fe08c599b04c7ee207c4fdffb101f069a916d8e6007f5ace8cabb. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCAFR2179974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad4a62aad8a627b4494f06d4c54d4caa34c4dd8dc89049d59dca78fbf47c79e2. 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/TCAFR2179981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeda06b985bb805cc0355ce02ecfccd4fabcc7231fb3ea0838bea95002f2d053. 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/TCAFR2179982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x269135c158a0e8647d8bbd69c5eb28e2c3ef127868f04ec0593d163bbbdbad7f. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/TCAFR2179985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f452d7aa28885a7cc0bd6452723629e83dbf58443df0547d6efe231c7c267f9. 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/TCAFR2180038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a86a78b6c35a17bab84e5ae7ba9cde588412c38e19f50359c47f09dc08ce73. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCAFR2180040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6428e9e9b3d03a82ef8911227ae91fe87eab879ae87c51b732fc1b90ec60368. 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/TCAFR2180045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4ea0abc01b968ba218a12ff873b39c365c71bfcee334d52151033b63fdab5d. 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/TCAFR2180047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df3171aaa8c45904b34ce9f89725ddeae5c18de957e2ddbb025945f24ae85c3. 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/TCAFR2180048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e84bacc4ba2d4706a025659c599b7edc16165e6894e7a0c6382ca237043fa68. 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/TCAFR2180050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a1330f6c01fad954b34dbb7499e8650bd3f37e2d62f8037875a40f04cc2e995. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/TCAFR2180053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1183d9ab4174be5e2f2ffe12ccc06886cd00dba0303f299971de840c68a9fd40. 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/TCAFR2180054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0634b2b9bb3f35c73169d17bbcf8b9744322a4b3dff5fd5c831229667a8026ec. 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/TCAFR2180058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083c74eb9f02231ac31d6a605e896b19db33e0f80713331e8860eaf81b460f82. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/TCAFR2180060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b66eb40293cacf8127b1c7b426bae32b70d082bcaf9f589f38d4b59c050870b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/TCAFR2180062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79e340cadc61b31860cb821c0a6e907b49cf4a5359a74c3e51fda3576d4d1fc. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/TCAFR2180065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20f8e183e0aa1e15276eea02287a7931e3bc98f7389442dfb45ee3482e29fb88. 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/TCAFR2180068.