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 0xec59d0548c4b7382fde3f925533118bcf70f0c2abbcc0711cbc0980b8e22f36d. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b400dd47-e076-415b-9eaf-b757811413ef.json and https://artists.proofprofile.net/proofs/artist/b400dd47-e076-415b-9eaf-b757811413ef.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 0xccbc6e38c146fc96150851b06f22e879b9b21096a6f4c7237fa5fa2b70cb988d. 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/QZHNB2413654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dc3d5f985fea400918c3197793e0d94cf58ea5e08014cf166b4ee054028980. 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/QZES62401257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97e30efe3639df0690f312c6381d8781338f96071ba6a3d56a063301a660b08e. 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/QZHNB2413655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b2fdcd6b64434047b93ddf6dabfebadb09e7edc9d393e60950721323c22332. 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/QZHN52403993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb09000f8af205ce410ef49912f212f0384692e2606b7752e9f01003a3347f756. 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/QZNWZ2270972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9b46ec428ab22338b565d0b1ee68c7fadd3bd1243e8791a248e329847fd523. 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/QZNWU2260103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc44b8eda94e75b5e4591e2320b5ab31d018f2da50196c340849a6329dca849. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZNWZ2270973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3de75c59c74495877df490119cb387fe8eb302bd6911b60fb4f6c5e4a2e35ba0. 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/QZNWZ2270974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf039ab93ad54d4617cb8cd2f4b6a4113fae62c0765d852e75c3ce5744f3a533. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZK6K2078930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52b969f13e6e4af88b65adbb9d3487c8b4bdeddb5eb2f9241fe37eef0f0c59dd. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QZK6K2078931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ceb2c06d869a3fbae33593bb4377ae228f635bf610af7fb556443dd4672cce1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/QZK6K2078932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd96261cd3d4f5ca578cae1f5267fac75a6fb0839ea138e4d316d9af89241f3c. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZK6K2078933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116440f798070ba5f420461fbb3982f56016cd04a6454e20873561701f5e11a3. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZK6K2078934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a90a2547f5f419c052ce1ae7c7953b1bddb0d4c68ec9bb72fee25c779eb0d6c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZK6K2078935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6afb93aa734096e8a20c857245dd3198da474656d72e08128ad39afff38c66. 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/QZK6K2078936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e599fb20750453071913f4853633620f9a560929158c5b05ad2a4ab59eaa6d7. 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/QZK6K2078937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa362afbe9d503116f017d7b684da1d33961d2ced15274429e43a00e842313517. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZTAY2464829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7b2fdcd6b64434047b93ddf6dabfebadb09e7edc9d393e60950721323c22332. 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/QZHN52403993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44dc3d5f985fea400918c3197793e0d94cf58ea5e08014cf166b4ee054028980. 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/QZES62401257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9b46ec428ab22338b565d0b1ee68c7fadd3bd1243e8791a248e329847fd523. 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/QZNWU2260103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeab74fe8a4d52f27077b1866787af34ec39e57a6833c73842299ce3930f83cfa. 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/QZDA72213376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x052a8e27c48f96df513770a8ea2865422f149f518d671fd9776e9ee14aab75b1. 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/QZDA72213377.