thumb|1955 photo of a tailor at work in Wales thumb|upright|Fuliiru tailor in Democratic Republic of Congo A tailor is a person who makes or alters clothing, particularly men's clothing. The Oxford En
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00330ec880d853d77ab8db83c634508208e7a26645b2d5ea7f89fab5e47c9063. 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/40e6c914-21cd-41ae-aad4-3e75802ec116.json and https://artists.proofprofile.net/proofs/artist/40e6c914-21cd-41ae-aad4-3e75802ec116.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99da54d391e0e16addfe7c4cef2c14ac5f1c2344fc4b0f7728207c155607d501. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLRD52273723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03538c4eece165d1c77ea63ae780c432da68efdc09e70d8102c66de4a5e3539. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NLRD52273707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd56d52ef0f18282c236997599f2af6f16cdc05993c28d7b05e06fb50168b17. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLRD52273683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6f04b189ce433730de8c423d577b6aa0f4317b032071abf1bddec8cf12c2f4. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBEWA2202019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59a19985c09fd56974c4c2b821ed898bfefb9220c23e6911edd9dc482c01ff20. 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/GBEWA2201630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3539bd9cbb0d80a82f9a50796692444b2dc9c8b7073e63ee325ab150fa3bd77b. 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/GBEWA2200860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6469657466f7e28bcb1ef375cb7b342fd611dbae000a474442dd7273b015624a. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBKQU2472021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cf829591fd494440d36533536f2ee6f662d23c8e11bd326ab7496a786f0304. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBKQU2434877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a264c21b3ce7d29c1f67a2c15aa135ea098c20a2aa63252838ccaad81691f01. 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/GBEWA2301607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0880026366ac5215bd065ddee362b201b13d373738bd485ab2e2672f93e191c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBEWA2205610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41627675fb6fe28975e8c5848851fef1bef5da85181a35d36c9ed764599d2224. 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/GBEWA2402910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99da54d391e0e16addfe7c4cef2c14ac5f1c2344fc4b0f7728207c155607d501. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLRD52273723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99da54d391e0e16addfe7c4cef2c14ac5f1c2344fc4b0f7728207c155607d501. 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/NLRD52273723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1458c7d8ccf321455b5c1c24dab97604e9aaa39c3d66e0e546c48734b7bdb89. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GBEWA2207892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418c99e1a262382a445efee60702602f746a6032561a01bece299aa2464ae93a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BEN582200513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43750ef0631b0a0864d7732db290c6f690e9b88b4fcdfb241ce60b1c3f5321fc. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/BEN582001014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46639b5fc11a8dae02499a50f14c0cbf319c67da85eec3a09d60d2764073b31e. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBEWA2402008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6f04b189ce433730de8c423d577b6aa0f4317b032071abf1bddec8cf12c2f4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBEWA2202019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54810838a7e4ae3cca8403652d5c30b0e58f3a78f85d517af259e669665ac36d. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/FR9W12210332.
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 0xefa3535272b61e02d31886fe17abb086569cbc1f41c79ace91be5ec565d920d5. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBEWA2401890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x208025a33673aa5ecee01bc2da48f82796bb747ce13c4f81c0c7357b6559d8f3. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/GBEWA2307086.