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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8d3ecca6d6310f502070127cdd966473ddc4ae0e99bc5b5c387ea333a6bc25. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35135139-d6b3-4a0b-9bbd-8a8427e3cc59.json and https://artists.proofprofile.net/proofs/artist/35135139-d6b3-4a0b-9bbd-8a8427e3cc59.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Early American Choral Music, Vol. 2: Anglo-American Psalmody 1550-1800
Chester ("Let tyrants shake their iron rod")
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf275a3fc1f29a2af9f81539a3b7598b667d82c2ae601a93c77662ee17e2191f2. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USHM19612810.
Amanda ("Death like an overflowing stream")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f608250458b4ad458aa35abb629233dfb216b1a0ddbf5fb768b9b4f37321031. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USHM19612814.
Windham ("Broad is the road that leads to death")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7774461b499cf19244154dd0946761d84e9eefe4588761d0f9d764e87d234d80. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USHM19612816.
Rainbow ("Tis by thy strength the mountains stand")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e6dfab56903be423028d93d37700ba6fc156896ae5d5edade6d17057fe7719. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USHM19612819.
Evening Hymn ("The day is past and gone")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0cb6897fe72b074574b116695b082b8dea9b1b62fa19535ac2382368f1bae1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/USHM19612823.
Colchester ("O 'twas a joyful sound to hear")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4120797ec613a9d22dd440f589a05fc8ac0f1ee78281cf6132d68595d8e8989a. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/USHM19612801.
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
The Humble Suit of a Sinner ("O Lord of whom I do depend")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b5ba4e27408c4b44c4a1286c66ea0b44b1e7e28d83f2ae5add4ba6b66d69189. 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/USHM19612802.
The Lamentation of a Sinner ("O Lord turne not away thy face")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ade2688a9d52c306a2f5b564dd292f1e7d3a62fdb433cf2bba0c76d6a56d114. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/USHM19612803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c5a61e91e4e99c3bfd519dce6e479c73b71745bde5d5452e1b64868e03dac4. 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/USHM19612805.
Cambridge Short/Southwell ("O God, to rescue me")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562f61bc24dee78e42ed4a540d18c418124c9d2f68b5b0c6cf851be892522fd5. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/USHM19612806.
Thomas-Town ("Great God, how frail a Thing is Man")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2324579dcc457a074336ed0f05c38bffe9f720ac2ab5ba083ac0ebef7112fd. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USHM19612809.
Chesterfield ("Death may dissolve my Body now")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf187cc3bd0d6f9a259346ba94e25db3531caa1eff28f063d57f8b56d2b3ffb28. 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/USHM19612811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08659349eb81b37ef36ab8258309ba46928fb338b5e0cdbadf4816de8119fb3e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USHM19612812.
Worcester ("How beauteous are their feet")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaa0209e619c0bb2cba3686b686ceb87d407470ae748a7e6c180202b361915e6. 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/USHM19612813.
Montgomery ("Early my God, without delay")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84936ffb50bb56f9f8422f8abac82cdbb95cd1c77c22c8bd4343213177fe8da. 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/USHM19612815.
Schenectady ("From all that dwell below the skies")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d919098ae04b9e201f1b2897c578163c73198f7d86537cb344822b90c4a326. 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/USHM19612820.
Greenwich ("Lord, what a thoughtless wretch was I")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbedf625ddc93d8780581834894f91156a0c3efe3eaf9bc38972100ae2fb808cb. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USHM19612821.