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 0x1f24518f2fc4a37684ceba7f968fd412b3610c42c3aa2825d7747f36dc361bb8. 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/fdf5670f-892e-403e-9283-ac53ae9bfaa2.json and https://artists.proofprofile.net/proofs/artist/fdf5670f-892e-403e-9283-ac53ae9bfaa2.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 0x7ac24ca0e4c34f9db5c98dc9b3f8f964482c2f371a16ad7942fa52edf4e511c3. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZMER2039694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c720e3c353dca1989a58bbaee500ef75e9ebcaa23db7c3c73c79995d6b01049. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZNWV2059409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e12de0c0dd24c74a7ec27c4bac0f006108ca9799d3540973911d632c7b4b46. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZFZ52193400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5480128469f1682e263f74aee9cbe0ab2ed39806d8e4e0c23f2f15da857e360e. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZHN32187345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2073ce6ad7c348aa1050dc49a924ebfd85f67e18a701ca21723b7de5e5f558d1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHNB2294034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdce932eed01b314fa920ca023f4e54a60a6e594d377d721401f05a61fcd00e38. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHNB2294035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e38e3bac0508cca96b6b85f5ef0d5aa2a8155cc145bd9121713f0e11f9ec99b. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/QZFZ72324568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2d650ce7de00a59fe21c41ca45d93c7ed33019d9bbfad4909ebcd3beecacb43. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZZ7V2456153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268426dbf4f956215edf3db0266307cc30cc20a1ecfa2db7fb4d7ee0e4a26040. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHNB2588050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81426e4b9ff51e31ca631556d2a60fdd14dec0bad665624d8ef4f603e9992c72. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/QZHNB2588051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318ac38b60285e7e9381c14ed89cd57107ca4fa0a2b49153d17ff250d96aa772. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZFZ22568007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d8c40093540c07dc9a9c4f06441d037941124f5a4ba3e2b6795ec4045a8ff7. 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/QZHNB2588054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56f3c5a758c6fd2b051c67c51287049eef47bd36b470872a86ac8e1a4fee05b4. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZHNB2588055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4168961dcaad0ec283a2e3517c68447e97afbeda40015974e4776c1cf0e8f34. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZHNB2588056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd910146fd5c1a95000919988a90338cf36cc7f8452673642e90491582a5be9c3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZHNB2588057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71692fe0f84006f36b75250fa4f9c6a35d6a456b54b9b4ef71f2faaff30c5176. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZHNB2588058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd462cfd39be5b8a3a3ba7ab0f3380efb73aba613254456aa20f275e2b4ba757e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNWX2529245.