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 0x2f3b2cad295b9b1887049132b922533c401d675a41083262228824a0f02818f1. 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/d2f62b36-90fa-43d7-b5cb-45b2cd19db02.json and https://artists.proofprofile.net/proofs/artist/d2f62b36-90fa-43d7-b5cb-45b2cd19db02.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 0x9d7dd582779391a04961ba189764f8b2e10a5a84e9abf3fbf7ce1358311d99c2. 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/ITB552216774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0554a7e4f54d8c4259f9cdcc7b3ee65fdfd1d443aab295093e1939f754f44a38. 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/ITB552316810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00645f5468bbf85edd7a324fa82471fc80cabdad1d99f6ce1e75daf5e5a896d0. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/ITB552316989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf831481c1c17caa7f19d1a375d1c0631b3193bc74b8eba9201752ba3b7c690b2. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-20T00:04:36Z), 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/US38Y2308507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x009b37764cd727fa201a01e08f1128e72e4f5beb264db5bbe9c3f9eec153d195. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/US38Y2310371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0028c767254f2eb0e137ccbce829b98d7b94c01bf24a802a5e0611b9329f62. 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/IT7LD2401172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24825e26f1d86f86b82c71285ecfa857acc82917e5e2e3ae17edd25b58a1a6f7. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/IT7LD2401986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648fac52472847b346d78af595d3bf9cae9a5c579c8eba776738b15e21c88c97. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/IT7LD2402835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c70bd885adcee355a3f3ae354a51d9ed5009e89e491015ec78e5d6ab58bf58. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/IT7LD2403254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0028c767254f2eb0e137ccbce829b98d7b94c01bf24a802a5e0611b9329f62. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/IT7LD2401172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde572061e12395b806ff7128c60e15ab9e8bf5887bebe9b4e10524d6e95ea107. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:05:40Z), 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/DGA0T2415885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138db98a4a1530905ae4819372051ca32662bcf50c5e3a572894ac3980e81129. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T07:02:49Z), 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/DGA0T2415886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648fac52472847b346d78af595d3bf9cae9a5c579c8eba776738b15e21c88c97. 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/IT7LD2402835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36844341209a9ab2f78fd91108c201ac29d0565512509f8f495c8527a7b8c56f. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/DGA0T2415887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73d58d3f98506aa29fb34abfd16be43a611f68311e2fd1450b90950a33174ab7. 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/ITAXQ2500074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e821661b6d49da1c2b04cdb5c3faa73c5f31c71b75c9bdbbd43c9fb934df7f5. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/ITAXQ2500082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef79070dc565b95b50d6c85a711df023edf284278cfa79061c13d68a30c57bc. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/ITAXQ2500091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3028f197b120ad2a75607b6e31753134d471e3dd53fd537e4787635b58d6811d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/ITAXQ2500105.