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 0xd984b1e31763019ae6015587cb87d818f4cee6916879a1d94322f34109703e9a. 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/3d0d7468-37df-40d2-9b09-5669da4c813e.json and https://artists.proofprofile.net/proofs/artist/3d0d7468-37df-40d2-9b09-5669da4c813e.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 0x7c1c04bd14dba38045b8d81bcfdab79e6fd011d3f57dbfbff1b88115a3031035. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CNE041600255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18bb3556bb183f52ca352db1421ebff268598e13fb7026b089d91e37445f079d. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/HKG732156162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59cc9ec4293fa1b2766e1d978cf31e5d7a710c63a5f5391357b80022d2ace024. 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/HKG732482406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03dc6ef4c8ba722bc3382aa827ecccd7ff5083ae3ab973cd3d493d1d48f0202. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/HKG732482409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4b3305975bfe2cf1845c43346ae099d4d110c58de5e15b48ead174a82a390b. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/HKG732482413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73462cbacb7dd2498184184fa67e73cef91dd9b28a994f8511f0a803a679a67. 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/TWY312311001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aca06dff0a3f68009506f1bb07052143f9024aec36dba876d8029199d9a1afd. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/TWY312311002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9499fc17adc7ce538451b91455a2ec6a6a16fef8db2181a0bb0e64f7934e849. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/TWY312311004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x898abe591d3aa278ac9a743e1bacdc415dc0d20ff9ff59c8c35cfafbeb0a6e67. 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/TWY312311005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e8042af729246fa800f0d20ccd2c5fa48839ee68d103ee71cbc6e86b8c7a55. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/TWY312311007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a15b07caa104376d52ecfd9a8d62df6df5473dccf44a7953ffc06af31c830f. Chain 2 (Bitcoin): anchored in block 957622 (2026-07-11T22:55:42Z), 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/TWY312311011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2976cb24ac171620990d1f175e88aef49a4a737fc4582b3c56e4143b8f0639f. 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/CNZ632000013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7221b3943ac1d266803bdeb83fbece3a53aab56ad863672f94371b49e44b870f. 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/QNSM12400372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf00851acd8aff5104faa4858cb10a8e848b9886432f7e5d47de716e9c10e228. 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/QNSM12400373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6e402bdca6428d5ade1073acb7795d0657d90288375e617ee1d8b398d207df6. 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/QNSM12400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdbd0fa6ff7ce2ca9d8a417e6cc452da326c71ce8198a5f4886114c23e7a2a3. 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/QNSM12400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb794b774ff7b1cc9286213a7e11b22a75c5dac009168e6044c93f4c020b6b69. 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/QNSM12400223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e20ed7581a5cdb64dbaba7fa41b8fa8b24888857a657049c01dc9b6e64c254a. 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/QNSM12400224.