AC, A.C., A/C, or Ac most often refers to: Air conditioning, often abbreviated as A/C Alternating current, a type of electrical current in which the current repeatedly changes direction AC, A.C.,
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 0x7cd183d11fffacaf20868cd3abc325415cc13506576374f75184f40d4ef47f76. 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/1ef8477a-0a8b-40eb-954d-e1ce2659563c.json and https://artists.proofprofile.net/proofs/artist/1ef8477a-0a8b-40eb-954d-e1ce2659563c.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 0xee287a1cfbfe0b4ac2473bf5285dc5db1bc52b3a15671a90936396349157325e. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/USL4R2138727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc226cdf40c5e19ca43df5be84777c34c16b9c05b5514e593a6cbd6ff56d42925. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QMANG2230431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfad4ecc997b08f4c6319e98555de3823d8583f14fd7ed144eba52187e767634. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/UKZGC2309741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0012fdd8a9926bf868ded5e151bd2530feaf64bf53f625a7de83424e801a8fae. Chain 2 (Bitcoin): anchored in block 958130 (2026-07-15T08:37:45Z), 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/UKZGC2401055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a959fd2d5fd8cca206b39765b1e776314918aad2b923395aa7a2e58278879c8. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/US3DF2433344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e341d8a584deb1be48cae80aaf33a54cdfc18f5a887f782bdbad1cbce070cc. 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/NLSB72400337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe0772868704cbb6a6bf36b3eff05932db93cc18211fe58814d11a08acd33ceb. 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/FXR592401246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aff0479cb71e3511072c271e53fddc4a2b65938a1bf3190e418bc2227590a49. 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/FXR592401247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x923357261939723b4938ab08c6ccbb8ee9a44ce8e931e78b7b1e2d74e17f7ffd. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/FXR592401254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73c40fe9c70fcbab06b8199460b82ff67e30ed09d11bb9423bbdc14045d37591. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USANG2462973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ec97dd83504b0ae9cb42623b4a370657e1d4597a0d6f0ee707cbd46e66c9b6. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZMHL2408645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab507e6728d36e21dbc75c9580a723adda24b4d60054c5880190c9be79dad4e8. 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/USANG2494279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1492cd0723884870fb8aca853feb3e55b010e15174cd47aa1d14b96a88bc3780. 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/QT3TB2421591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbc21cb69793e04bbcfe419dd5b2c0c00cc526f121c8a828d6719805cc47af8. 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/UKZGC2501977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810fcd9a11d0fbb9c3280b09807f461610bd4d9154bb213d3ccfd8b476f1f548. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZES72591212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca65444fe87c90f96f6f9ed9c3fa48d7cae1c66b47de73595cf295e835199994. 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/US3DF2536530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x698ce9555a3991279f392657a5035ca5133a4352d59e765c9381f9c710be753a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/US3DF2563917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2147977a94c09e0a1fa5b40ef0940b2a1bf5406cc4b5532d264755db5dc5bad2. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/US3DF2580301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6757c980350348b1855af61c2afeb808ca3f0f6b8e80f8cdb96dd63cbbbab0d5. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLSB72500552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60837acc0bd33c04b31258cc0d34289d98298df4b1e4edc2ab5e967c4bd3d28. 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/USANG2445701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666f44df83ca05f59134249c34304f12c1642c4ce811a54bd1c249512ab0ebb4. 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/US3DF2440279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb355a0a5ae5b2d99c31749d4662f9433aafa64752876c3e522f33bc5445de2. 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/USANG2441563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec9e63bcb9547c07484ebefc43e057c785919f6f8ba9f6b52cb33a169140c3d. 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/USANG2498973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbc21cb69793e04bbcfe419dd5b2c0c00cc526f121c8a828d6719805cc47af8. 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/UKZGC2501977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a431081b51235579cede6b3adae03ca6dd2e406957d9eb676204c31c866492. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QT2VB2455319.