thumb|right|A diagram comparing the size of an average human diver to the size of the modern great white shark, whale shark, and the prehistoric megalodon. The illustration also contains a linear meas
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 0x7b01d2c3adfe8af7b3dba53118da70cadf4f2ea3780c9ac0f739cd50b392d3c1. 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/c95cd26d-8003-45dc-9caf-38d29d9923dd.json and https://artists.proofprofile.net/proofs/artist/c95cd26d-8003-45dc-9caf-38d29d9923dd.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 0x6afaf5d73123c136a0d261b72fc087a8beb8832a877d3d0a50ee685bf622f6cc. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZHN92020984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aee2ef4d40e5284845d2045fc660ee7c3925ff451f9c1655c0c11128eb2fc49. 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/QZHN92020987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7188364505300662c921297a726c3593d09d424d543740e956cfbbeaf88d3987. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6XS1807648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116c144f7f2c41ef78116d33b27ae9d06a533549ef74e76471805bf185bf1aec. 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/QM6XS1807649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf1644d39dee1b900a300918d31b1549996fbdc9336ff86788650fb9685477d. 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/QM6XS1807650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc64b249d492718108c8552f0265eab4dfbbf7d05cb9286483753695fb2da1a51. 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/QM6XS1807651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83dbd5233bd5aeeb8ae355fea0e61be5d35ef7f1d717aa412af2faf4a559fee3. 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/QM6XS1807652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80bd507abedda43adae667467309e90627aa0a86be7d2774fdaef9dae0eb003b. 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/QM6XS1807653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cf134af64cd0b3385159da93d96c18bf551017e768f5920b25299cb2fb76dc. 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/QM6XS1807654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa252e283f5cf3dc67026873bbeed48bb48d1d995ebee742078c7f07cd6ca3fc9. 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/QM6XS1807655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd232479cc37cb516e8283f30aa85582ef5e3d2bab9bc718749297382b5f42b37. 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/QM6XS1807656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cd22d02095e87a987f598cfbf10c292f87c91248bdbc050c3df825d8a1fb79. 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/QM6XS1807657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ddd30c9fb92787c652d5d95f4e116da21d591b560f1119743d2a81058f2411e. 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/QM6XS1807658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34c57da07efa39042e7619085c4abbaa140f38e64a656ae68a9f0021ed284a1. 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/QM6XS1807659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c7230a3076ad81804396be59487ee912aeb0fdd4ee56a6efe594c0b41de1a3. 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/QM6XS1807660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x326f35a9ef0039714dc69e43ea0530367691fc3f54e2337b550a2303b86fb46b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM6XS1807661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc167ab615cb4eaa963e703aa9a6503499b05dd6c25c5186650ee383d161ec0b. 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/QM6XS1807662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924d59e6ccf40e9ed5d73a28e649ffc45de4445f7a8212cfbe899045ae2597ce. 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/QM6XS1807663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5202f031f6cee0d9f869a449a863d674580dcfc1fa2e83a57ddc00fc03de9e4d. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/QM6XS1808979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2435750e6dff69d16c8e60f5070bbf8728915e1a121a7b301d561b3738a2ffd3. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QM6XS1808980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb741662f8fa341fe9d92889cb0cbd9cf56ef1c81c450099a62ce905fcaaed9ba. 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/QM6XS1808981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c526ebf94d05cab75e6aae9aad448296f692f23358db999fa12bf48560949f4. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/QM6XS1808982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f002c03a071cbb41ee6946d05777a9204664796502eff61ae2fe93ea8bd0566. 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/QM6XS1808983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e328ca097eab2474631d6bbbce756141422f45d54c3cb634b4e043e966145d6. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QM6XS1808984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb20db1968ccc9373ffa6841a5a47d69ef89cc30d66d2ee3f1b25c52581f6529c. 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/QM6XS1808985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ddba07bc0036fda04d575018d3c2baf81cc95622015cc82f4f002ceb039e12. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QZMEQ2177011.