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 0x2be381283aa5793e782fed7b5efe629caa1cc295964c5d48f161681eb2b7e47c. 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/0589eaa3-a5d9-4af4-b151-cd73e4953c49.json and https://artists.proofprofile.net/proofs/artist/0589eaa3-a5d9-4af4-b151-cd73e4953c49.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 0x02cb7f5414ad4606f3d096730e169118b3b60e6e0ef907e694af618723b0574c. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NL1LE2000637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb5798a455b92eb25e6522d5f5564bc31be0e8da76160934ea8ecbec595ef3f. 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/NL1LE2000639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e5a88527ecf6226eeea3e257f3c49632f78b0c7ec465e4e1fac102f1985f38. 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/NL1LE2000641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3bff7d59508a4b5fd81a8a8c8d299aac7e8332afe1c470422dc48e7af65924. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NL1LE2000642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6030b91ca872c380a1f5518632aa11d08a9fec7bb57cc6a59044443a35a3ee65. Chain 2 (Bitcoin): anchored in block 958185 (2026-07-15T18:19:04Z), 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/NL1LE2000643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cb9d0532d4082d81361afe2057c532c8253ebdb94bc8bed9e9968dfb8173b6. 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/NL1LE2202589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09922800c30f3a0fb70c8509c2e7665fb32f9c37689047b2908b0e03a28ae213. 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/FRPGB2428910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ae3ac21554b7e89673e24fd02e7e2f449e851e1f1aabb5c629c2212a4ec061. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/FRPGB2428930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09922800c30f3a0fb70c8509c2e7665fb32f9c37689047b2908b0e03a28ae213. 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/FRPGB2428910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42edab639128243d2e31d480fe65242e9544192a73bfea7be85358e8df0ec4ff. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/FRPGB2428920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51ae3ac21554b7e89673e24fd02e7e2f449e851e1f1aabb5c629c2212a4ec061. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FRPGB2428930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f391b49f092a4cea77ce9e83d5119faab561bd28ee192bb157bade06dbc2c6. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRPGB2428940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b59c287ff87b1d086bc8da560b706995ddefcf0450fa1f9065345f24fb796f4. 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/FRPGB2428950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264a78108a2c65cc7cc32f3eed2c1b459afbf38df4792fe2bfd906f8a36862b3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FRPGB2428970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a41d912085f812400e7eb01f8dc717c4b49891bd05b570e36881347e94b6a4a. 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/FRPGB2428980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e78df85c8d8ed80b6d1da5060182b7fd052505014d46fc9527437b56fbe5fe6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRPGB2428990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340a6c4f4cf0d18a90d19d763365f5204a55f0784acb2d27e194218ffb85af91. 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/NL1LE2000638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2483818e366e2607ba5a3e7b182c30e74662a899ed21ffb034aa0d523d2262ed. 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/NL1LE2001486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3cb9d0532d4082d81361afe2057c532c8253ebdb94bc8bed9e9968dfb8173b6. 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/NL1LE2202589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41abfdb19b2eb50cf6818b64c2bc01374c82d889542936f77f3959d50ef14496. 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/NL1LE2102510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e2800905bf875dd76742af956a004c5c14053fde8bc909029033b48c745dc9. 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/GBKQU1886830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7d35f5758fc8c77b89c5657b3a3d190611641a28b80f73d48d84efac6da864f. 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/NL1LE2202618.