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 0x67031d4e45f6a08ed3a462f15dbbeb36c4e2805df1b3eb26ecaaffba48c1afb2. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d7fac06-f84b-446a-99a3-6137c383440f.json and https://artists.proofprofile.net/proofs/artist/7d7fac06-f84b-446a-99a3-6137c383440f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sacred Treasures of Spain: Motets from the Golden Age of Spanish Polyphony
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 0xb33acf03b63586fa8510d531da851f5726bb4fb164a964c4424374e16c615200. 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/GBAJY2035901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510f85f2402f90b7aaaa6f5442c0fe56cc377c8a479afa21af5388814a7e3a72. 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/GBAJY2035902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6771512af030970406142095bd1d26e6c90bc349446e20d5687a090f306f2079. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBAJY2035903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f6940e656db1fffd5dff2e2d0c0789f65e6af5ed2590e62dad8d4d2a2ed002. 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/GBAJY2035904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ba6dd86ab1a4c1db3cde197b5852b496883ceeab54eebd1f28db3f5af7b782. 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/GBAJY2035905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x526dd44aae251ac37e37317ffe1102850e2c8d83628c44b09ed559fb0bb7874f. 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/GBAJY2035907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ee3af44c92e58013f99148218f8eb9b27832719e93cefdad85e4ed62a04c877. 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/GBAJY2035908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a1a57c5352f00e01b7935cb20ea110015423078c8b0a1dd78ce534745ea72e. 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/GBAJY2035909.
Salve Regina: IV. Et Jesum benedictum fructum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff64f82e7ab6de54093d37da9630803d68b71e1bc4089795862c096d5b5e45d. 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/GBAJY2035911.
Ego sum panis vivus: I. Ego sum panis vivus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b747c769dc2ad39db6bb504f0ad8b514c8f99dc2b38c0af5379b93dfcd2cda. 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/GBAJY2035912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e8c5dfed7df3bd500328bbb90fdfaa34e3657027e4fa3e9a1ea12848b05a862. 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/GBAJY2035913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7e729de6c7a964d78f4d245302dc7f1ac347b47ae7994f9f5827013c82c311f. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBAJY2035914.
Ave Maria a 4: I. Ave Maria, gratia plena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa99d627210012d5202a4016abc0fc22c6123d8a6a402828083ad25ea50342615. 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/GBAJY2035915.
Ave Maria a 4: II. Sancta Maria, mater Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841e3531cef63765db048401acc1c92a9926315f9c8d497766dca0d048c38cdf. 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/GBAJY2035916.
Ave Maria a 8: I. Ave Maria, gratia plena
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedff4bdf99cfaa5c30f18dc194dd2f0983ee8e58627ad601442837c95dddf208. 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/GBAJY2035917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c82fce107db38232b52058b94be022389dfada8817b2c11776cc7845a72806. 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/GBAJY2035918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18de68ae1f561b1f228d979aae66a2cb5ab951250e6a89fd843981c1842a3363. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAJY2035919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93570d457da73c1a73890440f0b8c909860525ad559c1112aa6b6f98f2cc0d4. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBAJY2035920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c73f99fae0abb3afcd096d19973b1d9711b2d2ba8276e5a626cdefb9466629e. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBAJY2035921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35185325b69eeff7d11171ccde03fc7c3bd5ba98f6f4f41891d678c1f929c34e. 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/ES7892401011.
Ex nihilo: Polyphony Beyond the Order of Things
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35185325b69eeff7d11171ccde03fc7c3bd5ba98f6f4f41891d678c1f929c34e. 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/ES7892401011.