thumb|The farewell aria of Sultan Bajazet in Handel's opera Tamerlano (note the da capo instruction). First edition, London, 1719. In music, an aria (, ; : , ; arias in common usage; diminutive form:
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 0x1a0cbc4acaf1f366b8e50b9c6b6236fbc40cf324f6edb0a52fe3ab86ab2dab04. 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/de0dea0a-614d-4478-912d-83849b3a21cd.json and https://artists.proofprofile.net/proofs/artist/de0dea0a-614d-4478-912d-83849b3a21cd.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 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 0x3b02e16da02bb419bc67f65c12539e6266b57809e1045351c68da006967203ff. 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/RUB422303236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60bc86efdc97714fa8aff0e7560b6e24f0a6eb787659b2b59c9a183c24e21f8. 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/RUB422303237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3097e7c3fa70a0282433de95ffc80edd3f274997522f6b1545598d9e5a5b263. 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/TCADY1831038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9989409510ba1624563e6e4142fb0415feda62fe9442c279ddaf0959dc9cf69. 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/UKXN22436180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e17f26d315850d2b0a735d54227d2e7ec744a9e31af835da86bb7839c1a4f26. 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/GX3Q92485255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c0bdc1d45e9a444e0c89d40a11c2f829b9b80f7e9861eeb159599afdc85e49c. 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/GX3Q92428390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1cf21845b2dea44fb77dec6ac47e31387f3596b8c448e873fcec6102ef1a38. 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/QMEZE2187211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fc20704e18689570e027b66395b82c927f92f837dbfdf0d3ab2389313996547. 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/NLZ542400100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61010fc1bcca0ae41261ed8244cf219af35e5d84a1a9eff044e9ca98f36ce27. 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/RUB422302268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51b409df0c50ed02f0a34f0f56bfa7266ec5c0800809fdac8c430a3d38754c96. 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/GX3Q92367147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40595154e2c588fa73154c80893d836c6db51a3c3dd8a156ca6c4f2afb171a1a. 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/QMEU32215062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494169833eca2e939b254b105616ef421c259c40210f9a23c94b56edab166cf1. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMEU32210088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9971bdab09eb61f07d2f500a0de21fec41bf1fda9c28cdb856f5928d5358ed. 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/QM6DC2073734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ffd799fac8678fb5dceb7800ec61b3c811fad910e37293efb4400b8a2347a4. 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/QZS672192996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb10472b8eda7efb5b518bcbe4c06922a339f90564007a97800e140e47d0f6c4e. 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/QZS652110286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06736227e405485772ab5d0bfd83010e795808ba66bd011998089e479f94efd1. 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/QZKDK2018654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051076960556bfa0a90983cf4ca2129fbe93b053c9899cfe697fd4bbd09c8d1b. 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/TCAEE1908709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb143d169aee5cd189f265370711d16465fe7b007ecc7844da45dd70a76bd1912. 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/QZK6N1956516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb930802ae6d28402d7dc67ad2d8b726e51e439925f1a9e68eadda074a7415562. 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/QZES71959675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeadff2add6960751af36b49bd860854af79654b652465b7364dda988427dc6a. 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/QZ8LD1980686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4642b8177d84e3575419424d458e03f4d1391249df5674566ad3df35191e684. 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/TCADS1834769.