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 0xc0b040b987370286bcef39ee3a8e2c15a7402b75c765b9eca8801ab3be1ae3e4. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73b34a29-0c5c-4c0e-ac1a-3992ddb1888f.json and https://artists.proofprofile.net/proofs/artist/73b34a29-0c5c-4c0e-ac1a-3992ddb1888f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Four Popular Persian Ballads: Leila-Leila
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 0xd4d1827a1b5c8b055b52c2fd57132d31a7fb882197380e9cd226c5cf8bd878e4. 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/QMDA71327847.
Tiersen: La plage, Arrangements for Guitar
Elegia por la muerte de un tanguero: II. Melancolia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b9fd42a7daa84c37beb1ab08249c8a115aa55afeaded1a4a3577fca944c00b4. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY332200822.
Elegia por la muerte de un tanguero: III. Epilogo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6f7c5b97905cad03f316b009c1f060caa7b56e246f77b8350a1c56d6ab04d7b. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY332200823.
Variaciones sobre un tema de Atahualpa Yupanqui
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x669fc533a3dfc3ad1cdbf15e0a1e88060b5e4e6f1cecd645d5a56059312360ae. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/NLY332200820.
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
Elegia por la muerte de un tanguero: I. Confuseta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ace69e18a4d61032e01d8d3a4c77a2e832ab673ad28d22005783014f9f1d8d. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLY332200821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d0601b25c8f23afa26bbb8b24b031b912eb821d1bd6af0fa16002ed0bc2088. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLY332200824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84fb9f44cfa8943e869b14e6b11881bb663b4fe41ba332e1ea466eeecd7aed5. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLY332200825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c75cb2f837ea031db4ee1becc6ee40133b62769dab213bf6ffcef7b6ca54c3. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/NLY332200826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b4cf69bfc45e1017691292a209d29851e48469d4c7a18b1f2f3a9c0e886f4ad. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/NLY332200828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d41e81ebb736603a7377870bc5279a05d0bb68810cd15dbbb079dfa08f31294. 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/NLY332200829.