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 0x6bc322da31baed88167e057631b30e4414b42433e2ecca3e9e7e89f51bb23661. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7d95cc3-7c64-4d1c-af80-a565384d3739.json and https://artists.proofprofile.net/proofs/artist/b7d95cc3-7c64-4d1c-af80-a565384d3739.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Carlos Di Sarli y su orquesta tipica - El señor del tango
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 0xfd975c1c08a1dcf9e9f0d0527d4a3ab8029fec902fba029a9497a509bfa74f93. 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/ARG991008413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d7536f90ebf2805c772f2d5797ea9047e3ed59e56ad2eb68d92a9139c4576e. 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/ARG991008415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83b2f10cf2f018a3f6abd73e44d5349c4b95f431f355542e9ce66f34e5b2adc4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/ARG991008416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed87c9ed26b5ceee9da65ce4b8a4aad0ed1f8bbdd984bdf1e4a4e6e19d07a949. 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/ARG991008421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a297245a6d06bc42d560351f765694b4ec30f82087b3610d3020020ed160bc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ARG991008426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe50a36dd164e64de3d946317a8673ecf770607b4afefca280d2275a738d2e29f. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ARG991008414.
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 0xc0c4e01ee6cc994a4ad699cd010daf092d71d9756a48de87553d5c95e93389b1. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ARG991008417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca4c2a59a5b1626938c825aacc4fe9d55848e14f47ba4ad283d913acc2859a6. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ARG991008418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25b3d5fce2ebc35685fd2c02d49a88fa479ccaae85b3e1fc2e39bac82592eb74. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/ARG991008419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc75313aad4e98cc5c27ef22d54850159a989ea91636661f9e35cac1d49a9e5. 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/ARG991008420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12870fa2956a3e39bf7a93c9c7879920d9cbb8de0469941d102057506321ae2b. 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/ARG991008422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1995271519d60abf8abe1b9ab28c39e0af7955b70b6bf41ad5d564a857d61cc1. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ARG991008423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac4b0adab724c5a4c656a82e4137c33d903813a39507d82a6786103aa8176427. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ARG991008424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0290d798dc7c62bd2a6cf32efe034399d345b0896e778d2f7d3c633f50bf2cc. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ARG991008425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c856300d33327115e73b24011669be4e791334cd689aa6c59a3279cd0fc7f9c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ARG991008427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8407854be584637289d93770126a7c999a7a699b8ccec50d877c24e0a0499b68. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ARG991008429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b198cc024dda3b9ef92356e5f1ba8f7c4eb4d75f2ebfe858d5320e71eede2b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/ARG991008430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6171ce2161efac33bfb4884440fc1ab42b6a6ef1729e5e4a858259426efe97b6. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ARG991008431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4eed5822de6aa7752083ee58b84e8dc9ff6812d1eaac4be21c27da0ea089e5. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/ARG991008432.