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 0xc337c3e9299e1eb9f5c4d081fe54d3fa3c599ac50bb3c6bcdf7f21bb64e34913. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3331e817-d4c0-4619-81c2-b172af3b892d.json and https://artists.proofprofile.net/proofs/artist/3331e817-d4c0-4619-81c2-b172af3b892d.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 0xb3d063a580844103413111c9ba82a1bbf1c2f24be8c0357c64918f3bbbb4c6c3. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T05:47:17Z), 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/GXF9Q2450221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033595567937551e9ebed21950f03307ece1b7d175a892f24b86c85dd3489d31. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:13:50Z), 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/GXF9Q2451014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf761c18b2f6a6e88a03b31ae6d4b6c54daad7a12cbeef360f6498fdbe75e1d. 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/GXF9Q2451498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7c8755362b1dc6568bbcf387ae3f5a91588bc473e3cfa13df713fbb7a042c6. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:41:14Z), 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/GXF9Q2450542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4a98978a5c545ac4f33c1bd8adfce9a55dd32cac3bd87881338f6f940fd259. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/GXF9Q2451423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2861f60f578404a4f0d93ca0be25b37a3ef409242d2766be41649eab4f43f1. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GXF9Q2451424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a603b3203fba82068fb813c7ab9fee28125094e0ffc54f74043e855719f297. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:10:14Z), 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/GXF9Q2451425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf811cc3287d0ee417c53f288a55b059d9efa740c2e200f3e1539ce676b888e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:08:02Z), 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/GXF9Q2451426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d862d80e20c3523d28441b3d41c0778537b6f901b020574aee86a9d1c2643c. 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/GXF9Q2451427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9124375517c616d80848c4519c8a5bffde2716e012245d7856d584cca3d575. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-16T20:12:32Z), 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/GXF9Q2451428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e9aa8df4096fb343b5e86f22ca4d7c7a45219475f507d82dcf4147aab45811. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXF9Q2450754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d5c5981590b7dccc0ae4a805e1008ce57a773caeff62e55315562201115e195. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/GXF9Q2450755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33fe25b58303af58999ad3a6d48f00c583f845e1393f51b568a4a9618f5d561. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/GXF9Q2450756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ba51f766ef5a19c5030ef921018cd1fbbde64a10dfbb4fe9dffd375c7de9728. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GXF9Q2450757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ecdb39dc6f9e098f2902a0faa306af8e3d3ba35df6b878174255a120f2e3fc6. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/GXF9Q2450758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d8ec0b82614892db087aee60194950105de9a2f3cb47a730c8b374be53684f. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/GXF9Q2450759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe776af43d6fd1b61daae0a0f6daea553a79e92f82dd9704d4a0f303c6a5e696e. 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/GXF9Q2450760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf958e5547259e9c7ac7f8b3e58413fa70845812f30c11f196832c4ac90fced. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/GXF9Q2450761.