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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a75ab21bdb53fc7f6c0e95714e09e37a8b9459f5ad6076d7e99553c11ffe11e. 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/9d4d4472-2c30-4018-8cb8-964b80f62d11.json and https://artists.proofprofile.net/proofs/artist/9d4d4472-2c30-4018-8cb8-964b80f62d11.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 0x032fd87b16fda1d16046bf7367af54f830e04b612883add04e285970fc8cb81c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BEB682000205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80c17ea71f7af83057a92e716bbe51c2bd2cb01e4492ca1c833d8a8b15baf1ac. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BEB682000241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac29c7368c1296eb5169782f76bd70c23ea0ab4cc8f4d27c7c79e73627f935b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:02:46Z), 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/BEB682100086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d82710123f8311b8547e9306d5785cc67199c7f03c0b8a0fce582e0b6dc002. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/BEB682100203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb664623f1724804faccc9a1bfd7b1ca5974e8e14ff4b303f2e5152b498104ccd. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/BEB682200246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64098482537937feba2b3e201b3c1a932af80709aca44b3f733f771c28e66976. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/BEB682200314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe444c4d761e00c75b44e05eac22d1d31993f030b3ef30e5040667a1cad0f1a0a. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/BEB682200410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5180052e808e4991dde2737a3e702b0869cc3f2ebf26ba926be7fff308a97435. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/BEB682200509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f17bacedbfd235a9dafef359be6b63d501c1fe71a5a69544f34629fc698191b. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/BEB682300224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8736f161598979cb07ee00017f6a713be989d8ba1a34369215f9c018aaf95926. Chain 2 (Bitcoin): anchored in block 958720 (2026-07-19T10:53:46Z), 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/BEB682300365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5662aa0a24d6fcb9d8408c3e3312ae00c433be7de84cc5e18b43e930747a05. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/BEB682400258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3e4b48427635900925fee23e08d4572c0262e086f9faac951ec6852aff68eb. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/BEB682400368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fcd98c6db5712e70aa56a2c016ead508c4ced9e437323fce2cd7bb56866d7be. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BEB682400499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x857811b8f85cc63f93a8d2d4d4fef1265e3caa77daa8fe688e0729a2db282977. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BEB682400952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7aa58cf6359f77d20d5200e5ffe28100c7650eeef52ff7710303933d1dd24d5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-17T04:36:07Z), 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/BEB682500481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8967060aace1e5ca2b7de5ec7858c953e9ff0b4af6f2e169bed4f3a814ac3a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BEB682000551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e1e15e1a9c224f72fec55546717697ff342d2b88dfe1615627a66af28ebbccc. 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/BEB682300741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbdae3c9c354e04e326fe520e090d0a1e7caa7d34ece0726281f70ae2f46060. 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/BEB682000339.
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