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 0x42bf17e884a876fd7d8acc1abaf282123a32170f23392ff53b0617590437819b. 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/3a949e27-9d0c-4235-a865-60d35db85c4d.json and https://artists.proofprofile.net/proofs/artist/3a949e27-9d0c-4235-a865-60d35db85c4d.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 0x7b527aeec9a2bc77d8e2d7bbfc40784f05ed61934603bf150a89f7b0fea560da. 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/GBN3Q2101895.
The Arrow and the Song - SSATB with alto solo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fc9be93fcdf0ac3166d46d76830b351b4cb6758e1750e412029395fc890e7a. 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/GBN3Q2101900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b2a502574fa4e8c08dc7b78ebbe7815f296dbb881d3883b09cde1b37134922. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/GBN3Q2101903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766cbde57e195edb968a02b616de8f5294ccebb5fb69df9d5b55d8d29c938c9f. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/GBN3Q2101898.
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 0x3497468f8c410e54fb35ecb9e1f9a1f501d0c05fe3e09c6a8797ffda209df908. 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/GBN3Q2101899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5246b8ff88b0d35728486fc236b2b171ecbd32d25c59496d9efb7ccf8bdd53c2. 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/GBN3Q2101902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x869fbedec25ab020f2e533408a1a20193d73950d63ab21e07b7b2db00ba935ab. 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/GBN3Q2302987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53712b54485240fb95a3e855ab97e2c9c2c9cee30d2ea0c3a03b8813171f86c3. 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/GBN3Q2303005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35dd963069ee3b266aca0c64b52acbe4d913d3cfee124b698dc7f302f649155b. 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/GBN3Q2302989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd04a18ab3e3ab38ff92240004e4eb6ff26fa7f03bea46699a72c366e59e068f. 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/GBN3Q2302992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7bb457f4f7b8f68f00238cc5405cd96746f75ce6ad897e1295e18ddf5ee9a8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBN3Q2303000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fd336908f4f1a65912c13769fe2bd2113977796477d1ee13c2c1e0dab69b49. 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/GBN3Q2303009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6a110169de5f4a36e93425922a2cea3f2fd516769d5f6bc64114683b9f46be. 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/GBN3Q1701126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c297acee8f8bade68a00e0764d530dc1c2f8759f4ab5461a7ab9b1f922b2732. 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/GBN3Q1901545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1de0e69f8176eda147ecc3b893af52b62c6df3a82ac8da5acb4a481f1108f918. 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/GBN3Q1701142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ab8305addf24168ce5c41f5c06d02a3cae232e7b7d8f865f6f68baf21f548c. 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/GBN3Q1901537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e7b3d4beca8d8ebf9b7288d4e14b605d8367cb7bd8672d3b45f8d905f13eb. 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/GBN3Q1901546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d0c1f782c3624f8c0c0ed16a039f3ff977cf324cd997e56d7b1feb850d24cd. 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/GBN3Q1701130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd49e94b8a39f6c3013c7948a592c1dea932650ffae6099b74dd083e5efd3c9. 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/GBN3Q0601475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad091abf400eff9415fbf21a846503afa5df6db30ebe4b830b0947080e8675bd. 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/GBN3Q0601476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa39e13d230e1dda6e08caccbb060f65b7e8a5b9a4b35051b3d339bb4ba72322. 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/GBN3Q0601477.
A Little Jazz Mass: IV. Benedictus - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceab95a1daf18328588f952d6d1bf1d35fdd9431dee277cb39affdaf16f44c93. 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/GBN3Q0601478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c663fbdb0a80904144bd971e9b3536701341c054b3435e3aacc31cd6dc1139c. 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/GBN3Q0601479.
The Music's Always There With You - SATB
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58474de17a2d8d50036fbbb55b619077399f8a226837770efe7a130d79206555. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBN3Q1701127.
Music for Mixed voices 2022 - Piano & unaccompanied
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90cb27c2f8c9994e6dd52719e9726a81fa5fe75ddf8848b7f46e5e8fed790c69. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBN3Q2202799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94d9674e4a95a937f37a0431b1877e5276107bc4c6518afcb71939a875c676fd. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBN3Q1501306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c91fd81066546ecf5935ed6897b666543eb5fb49fc15a4ba1f913a021f2db59. 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/GBN3Q1901543.