thumb|David Haas in a concert at the Ateneo de Manila University, Quezon City, Philippines David Robert Haas (born 1957 in Bridgeport, Michigan) is an American author and composer of contemporary Cath
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 0x4e4392a7ef530d10a29490089b6e464656e336b12a1f83de18d7d9cb9dd49e21. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8f5a68f-a434-4c5c-a0e0-19e4f793fa8b.json and https://artists.proofprofile.net/proofs/artist/b8f5a68f-a434-4c5c-a0e0-19e4f793fa8b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e88650180ee305702f48db7a56ece43a00f7daf3de67ca31656dfdc12e4cd6a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851600178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da4d8a406bcfc7079a8f749a3d5efb9203e8f64f0699c37c90169c26d174402. 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/US7851600179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc572385b462ab0b82e65dcae07c0f8862405d168ec1c952fe7bc60ed21db9087. 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/US7851600182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18541c5636ed7bb510d3c768cf1bb631b4fc26bcb679fac643a31a2d2235bd3a. 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/US7851600183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223221ee48d7bab198cb0ddd88a0957721c2103d12c6ea82a716a3ec6ad2d64c. 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/US7851600184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37593529f1de37cf463c6a526b7f6f51c0bd76893f7ee002e5e1a7847d0e8ef4. 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/US7851600185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cfa5308480ed2d871dca283f6fd12510952519258b9a4012d35c37ede85ea5e. 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/US7851600187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6bd954051b2c1e62c9b02ca90025673748a7c80bf7b29d210282a6c5b57cc7. 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/US7851600188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x681060b6f676b15129e7caeb51ebddfaacb9c4a95f0afbccf71c0ea7f2b3e486. 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/US7851600189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0548e22713b91bd0e85a051f9d6f488e03c026f3d35b846d65df2def9c85f7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/US7851600190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ede72b6cd70e3aba678a1d15f843de3548c97c74bd9f6e127ed94666f95443d. 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/US7851600191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7b246587fb38bb9ac19b4304e975aada03050dc842a3b847da9df246baf6e87. 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/US7851600192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9657c1ba410028437f73528407804db2715baa2011fff884fce9bb17fbe45f8. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7851600193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71231546996fd8e5193e75a4efcceb3ff0bc13d727b616c94486110450f0c740. 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/US7851600194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd715c9e0ed6a64e180478eb8c4257991c0b7410516138984267f89856287923d. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7851600195.
Of Womb and Tomb: Prayer in Time of Infertility, Miscarriage and Stillbirth (Compiled by Kate Williams)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f9fe08397c0a53f70f78cda28c31308ec62cf7ff080b2a2ad8305eef83042a. 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/US7851900036.
Benilde-St. Margaret's High School Choir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfc1e9e531b934ffb411a67c6d48a6001f16b2f44b9bca83b4c87e7ce8a208b. 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/US7859910798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425b31872d505d6b1f3ff8b0130ba573fddd2a3e922bde6530f9f48f9f69f996. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/US7851600096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f90084a0efc4598c867d1568546e8d12d28285299c2943fbea5eb8dbd1517f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US7851600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e88650180ee305702f48db7a56ece43a00f7daf3de67ca31656dfdc12e4cd6a. 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/US7851600178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8da4d8a406bcfc7079a8f749a3d5efb9203e8f64f0699c37c90169c26d174402. 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/US7851600179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0d57c0a29e8551f55c3a7586807d98fca04a98b6bcf5783bc4696a0629d7b8. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/US7859910801.
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