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 0xb70c85841222a2a117dd39ce111bdf1806e7fe695f5cf477c5422660b50efc3d. Chain 2 (Bitcoin): anchored in block 953710 (2026-06-14T23:32:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ee9a0e8-fa96-4353-be58-35e92d111935.json and https://artists.proofprofile.net/proofs/artist/7ee9a0e8-fa96-4353-be58-35e92d111935.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 0x574c72e822fc7d9bde219b2b01babca71bb139169cf586dc6aeb603e422fb305. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZHNB2007518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c46a33b1e06c038c58d2c51475b7c88b6c7687259d0d1452e92274e1aabd90. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZHNB2007519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab3bc5b4f210e9000c01bbfd9de01f1f63be0749fa3e8f8f60e02892bcd8e84. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZTB42200072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf43002bbe69688c9dcc902eeef72b85f06863098b58e080edcdded131b8bf1f2. 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/QZHN62479828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc78ab3fefbe2ba731516ec2f21f41dff32e160c9c745c462842f5a56e01bf01c. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHN62479832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a022a26f6ec312814237f401125bfcb0957b649ca24d2a31194078790ad07c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZHN62479837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e3f487790796fa7b36fd4acdab3485c00879130588c790f55f0fb59ec19da54. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZK6Q2409747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475f2ce7c82584c227fab4006f856738a790ce2427bd2278f0c32db54333ddb0. 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/QZWFX2468399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a801080bcefb7f834e19a15221445f036e88a49b634396bb8de519f3754dc5. 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/QZWFX2468402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1425b3df007dd685230ba8c24c0de212a40d2d6f26617bb6b1999f5255c90af3. 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/QZWFX2468409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc481908f81a728332543e5bf1d8377119d9c1aa0fb252a6e340d8ebcdec1cd8f. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZK6J2586026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc693a1921f62fdef646c8d1e1c935c3b7945644e843ac37acd7a5b0e5c45c134. 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/QZK6J2586027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaeaebaf097af24660b650bda5fab04c2d57b7b625c66a2b54943e7349ed77eb. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZK6J2586028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e1c0c357bdde16aaa9ef4648301f88726c52c88e1c9d0e427db3dea4adb2537. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6J2586029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87350e7bdcf23149cf06b54ae945d56c6c41eb2a8095cc49c0f072c990b00943. 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/QZK6J2586030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5366a82b5a54f76e3d67f20fc153ab33cfd52dd29a5337a4ddc85cf7884064. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZK6J2586031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7276dde80b1ab4e7693ce2d06f3200bd698493c3ae5d5a4e78da3f7346d07369. 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/QZK6J2586032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56cc12e8e59721eb52bf5d47c6602d3f6aabd099455fa3a9dfbfb9255c745c85. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6J2586034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99adf3a5bca956b444c293bc55f236723ddea74b407c3f4a7fc1000e0ca267f6. 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/QZK6J2586035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be1d69094d93debe38447ca45c9d341c904eeee543486b3f7765b120b460c1a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZK6J2586036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f12ccb9134333d1fe58129f9904ac2750927300cbfdb5231d7417a01a5cc260. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZWFU2513326.