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 0x1bd8227247d0a8b6568934a58ce955ea498391e38c6a95cd602d27c07c6cc188. 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/a63f1601-bec3-4b18-bae2-fa915d2a60cb.json and https://artists.proofprofile.net/proofs/artist/a63f1601-bec3-4b18-bae2-fa915d2a60cb.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 0x0d86b4cfdef73a48d0a46f0fc8c2dd181b5298c2df9bd6e65914d9d63623d891. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA7WP1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed8446e01f8c6d1102455462f5b8265db59b2a7c22cce0fe2f191f40f30aede. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/CA7WP1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692d7e55c5eba21e5a79d20d84d819201c076fcbec8f9afe0d82d537a747e3b1. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/CA7WP1600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4337fed93932927d22463f27e2c69ec50a73411936ef3d4477a9d641f649ee4e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA7WP1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660ca6faeaf8c5117b64c2e70ed4d48ddce93928a3a413031a6e47d8bdedc3fc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA7WP1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576bb52968b1f26c31ea07fcea988598022cea88294be7576dbd5632737a7838. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/CA7WP1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4337fed93932927d22463f27e2c69ec50a73411936ef3d4477a9d641f649ee4e. 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/CA7WP1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d86b4cfdef73a48d0a46f0fc8c2dd181b5298c2df9bd6e65914d9d63623d891. 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/CA7WP1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ef541f2dd365d06fa74b13d24ca9207bf0a32f72b21ec3f979153e6a5704ac. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZNWT2087153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ebdaf4fa405b31e64ca1337ebbf9598e9d0a8a4c86191c672f8c922b774d50. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZNWT2087154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd63c72f3e9b2d41f04bc0554eded9ec86f33dc15df924cd9b613ba67433245. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNWT2087155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffcd562bf87c6779f211ca84a6b639bad93dd922dc6f8943c9b79998bf7b7aa. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWT2087156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43c9073db2834d6e77b7106bcbb4719aeae70fa5ea779897c8cf2bfe4576c1aa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZNWT2087157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb36a2c0adaff40c93baf5e356fcbd450f86a98896034aa81d631ae7524806e7. 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/CA7WP1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb36a2c0adaff40c93baf5e356fcbd450f86a98896034aa81d631ae7524806e7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CA7WP1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x335ceea42869db9e80441e1a882b094d23122cfa63a20d10384be1072c308213. 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/CA7WP1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2823e6ddff18fb5ed3811fcf34fef5d49fe4541ca81c27edcc88254c1cb05762. 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/CA7WP1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7988635c36cd3c3e3f29f16f276f383191e24b0f53c628db4ce1d5a2ffcf7172. 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/CA7WP1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa88299aa054afa03e045d3fb547ac61597cc2b5a24b5e7af6947f472ff7990f. 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/CA7WP1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dfc0835d79a1c762b7ac59d25f5fb2d16cb5da0ae73c69121ff9e21779d199. 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/CA7WP1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c1b056e1196791414fe7ffa605444ed4daca9c8cd4b77c916a50213644dc01. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/CA7WP1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa94fcdb0271695445b772cbf07e2bc7028f02674c8834d971262113489dbd471. 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/CA7WP1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082ade6e98a463aa83107adac831ad8922cf5554e4ca6ad1c60768cf61b04322. 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/CA7WP1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7364ac931fd725328d04526f2a7af8cd72d7f01a66d5712d4f780701850288. 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/CA7WP1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7233502a8f43a58ef0c71c9febfaa05776200f1cc50bef965972f6b8009208c3. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/CA7WP1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d8997f29855fe01ef70f8fe84487ee217a1a3390a1bdee0a660230863400cb. 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/CA7WP1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x357610fd239623f64bc0b6398c5372ae44160f9dc9c2f383539fcd1ad4b9af38. 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/CA7WP1200006.