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 0xb34abf6ffc12be9b526a7ee84b1b9733cc898fb80a700d6ef8ada34de41424ab. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/502e9666-f8d0-4b9e-8c96-35bb25b5618e.json and https://artists.proofprofile.net/proofs/artist/502e9666-f8d0-4b9e-8c96-35bb25b5618e.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 0x3fea3aac5a5385ddf1ff1187eab29252b34fddc33e3a84c0b49ed1f4f30ba167. 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/QZZ762450296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef773183ed464bd32d04162ca724d4b2bfb5ae8d74a188bbc1f4fdd59a5ae20f. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZES72527304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3836164f785bd0de1cdb1d897500b1aaa85015eb7cc73503dfbe60ef89b1b44. 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/QZZ7K2544622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0ff96340d49b9a0a0806bd4c3d96679bc7e8df2db7ef55ca03181939477ba2c. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZZ7K2544617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79715ef8eece96a76b181c418984956a7f83df9668db27efe17eda0417d5cfa. 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/QZZ7K2542092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fae2e1eec727eeb57617e4a8e6e53ed7437a6ccde9b22ac748fcb4c07de645. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QZZ7K2544613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34112ddbabc2f9ba838ecc07bca26b558dc4c2aed7d79a8a950626e36a4688a. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3F62583984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a5e0a851a35242151e89359577a6e157c384fbd861bfffacf57e8109457dec5. 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/QT3F72580258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72bc6460b12002f34f489deecc5adbddf6d547789299174b74d14e042e3e20a. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/QT3F72556035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9943297ddfb932d756253b569188b27cf9468192db2444c94d0d80980ce9d562. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QT3F72554104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd25525708444c757ef2f2d8eb1eb390d94df37cac9f28de81fa02e0390fd9f2. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T03:52:09Z), 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/QT3F72556034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x348d79f5bd6984694c87877e86fb77f97cb0a232b737493cd1b46ffdf3c4e20a. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QT3F72589545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a20259237edae6cdd2244bc09b9e037d80b023ad2f973bc4fb2ddd7855a98f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QT3F72556108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1839adb04fde93b68387b8d01add9d3f29a0f4aa274593acbe4e3bb0beb97174. 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/QT3F72556032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55ff95068d2c55eb3670b5b5f9bee21ca55eed67334e09b3bfbe8b54c6b6eaa1. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QT3F72556031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e4eb3610ba171f77c724c50ef2634ccfe2c52c208c0b0f8bb693b26f934be5. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QT3F82569693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29de613948f8188181a3552c48b0232f9625cf1e9bc11de5c6b6f9535fae7bd. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QT3F92509353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x506b7df1d535dcfba944a4812e43dd87e87488f7f28e4a74406b4c1257749c43. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT3F92515248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4a6a23245c57b135f4fdfbcc3a4b958b7d28f88e545f8af7642131b7f6e24b. 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/QT3F92515249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7665cb5501cf0cbcd4aff0fb3fa5b25e0f8b18bfd3c5cef5b6d03cf73cab1632. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QT3F92515251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38edc0fd793a56a1aa4b64ef7c126e24d6182a6ed94768ed9f822b0e2a852f6c. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QT3F92515250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937df97d533dea942194ec20ec0395de3b3c6171dd8650e860ef4f81c017e358. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QT3F82579722.